I'm not just talking about any kind of nostalgia or harking back to a "golden age", I'm curious specifically about this particular type of nostalgia. I don't mean solemn and reverent, seeing the era as brighter than a current period of decline, which I know is a common theme. I'm specifically referring to 70s and 80s films and music having a central position in much of popular culture, with groups such as Queen and ABBA being idolised, and the aesthetic of the era being revived in media such as Stranger Things, almost as the gold standard for music and media that everyone can relate to. I recognise my question is quite nebulous but I hope someone can grasp what I'm trying to say.
Yes, in the 1990s, there was plenty of nostalgia for the 1970s - which didn't necessarily see it as a brighter period, but which had a fondness for the parts of the 1970s that it saw, 20 years later, as being kitsch or a bit embarrassing. I mean, a sitcom called That '70s Show debuted in 1998.
In film, you get plenty of Hollywood movies set in the 1970s, and specifically focused on 1970s pop culture; a random assortment that come to mind are the 1997 Paul Thomas Anderson movie Boogie Nights, largely set in the 'golden age of porn' era; 54, about the 1998 film Studio 54, the most prominent New York nightclub of the disco era of the late 1970s; the 1998 Todd Haynes film Velvet Goldmine, a fictional take on the 1970s glam rock scene (David Bowie, Iggy Pop, etc); or the 1999 Spike Lee film Summer Of Sam, about peoples' lives during the 'Son of Sam' murders in 1977. One of the most commercially successful films of the 1990s was Forrest Gump, which, while probably a bit more focused on pop culture related to the 1960s, also featured a portion of the film devoted to the 1970s, including the titular character being involved in Richard Nixon's Watergate scandal.
In terms of the 1970s bands you mention, you mention ABBA and Queen.
In regards to ABBA, the 1980s synth pop band Erasure released an EP of ABBA covers called ABBA-esque in 1992 which hit #1 in the UK (and prompted a very, very successful Australian ABBA tribute act called Bjorn Again to release an EP of Erasure covers in an ABBA style, called Erasure-esque - which also did respectably on the UK charts). A love of ABBA is a central character trait of the titular character in the 1994 Australian film Muriel's Wedding (meant to indicate how uncool the character is in the world of the 1990s, but also celebrating ABBA's greatness at the same time). And this celebration of ABBA wasn't just from 1992-1994; in 1999, a medley of ABBA tunes called 'Thank ABBA For The Music' that was a collaboration between British/Irish pop acts Billie Piper, Cleopatra, B*witched, Steps and Tina Cousins, hit the top 5 in the UK charts, and went top 10 in Australia, New Zealand and Sweden.
In regards to Queen, Queen hit #1 in 1991 in the UK with a re-release of 'Bohemian Rhapsody' (shortly after Freddie Mercury passed away); at a memorial concert for Mercury the next year, most of the biggest mainstream rock acts of the era performed (Guns'N'Roses, Metallica, U2) and had more success in the US charts in 1992 (when the song was featured in the film Wayne's World and hit #2 on the Billboard charts) than in 1975 when it was originally released (and hit #9 on the Billboard charts). At the very tail end of the 1990s, a cover of 'We Will Rock You' by boy band Five hit #1 in the UK.
In addition, in the 1990s, it seemed like every second dance track on the charts - from 'Fantasy' by Black Box (a cover of an Earth Wind and Fire song) to 'Stayin' Alive' by N-Trance (a reworking of the Bee Gees hit) to 'If You Could Read My Mind' by Stars on 54 (which was based on Viola Wills' 1980 disco-style cover of the 1970s Gordon Lightfoot song).
On another side of the musical fence, the grunge/alternative music popular in the 1990s had some deep influences from 1970s music - most notably the hard rock of the 1970s (Led Zeppelin, Deep Purple, etc) and the punk of the 1970s (Sex Pistols, The Ramones, etc). People at the time definitely noticed the resemblance between the riff in 'More Than A Feeling' by Boston and the riff in 'Smells Like Teen Spirit' by Nirvana. Such alternative rock acts regularly covered songs associated with the 1970s and so forth: Pearl Jam played backing band on an album by 1970s icon Neil Young, the Smashing Pumpkins covered 1970s-era songs by Thin Lizzy, Fleetwood Mac, Blondie, The Cars; Tori Amos covered tracks by 1970s types like Led Zeppelin, Joni Mitchell, and Bruce Springsteen.
Finally, there was a R&B movement in the late 1990s often called 'neo-soul' (think Erykah Badu or D'Angelo), which very clearly had 'retro' 1970s soul/funk influences like Marvin Gaye or Stevie Wonder along with more modern hip-hop influenced beats. So, for example, a (heavy) neo-soul(-influenced) track like 'Got Til It's Gone' by Janet Jackson sampled a 1970 Joni Mitchell track ('Big Yellow Taxi') and put it together with sounds associated with the 1970s (the electric piano sound of the Fender Rhodes), and 1970s funk-influenced beats; the video clip for the song is full of people dancing wearing clothing and colour schemes associated with the 1970s.
So yes, I do kind of have a certain nostalgia for 1990s-era nostalgia for the 1970s.