Very. The movie made in the 90s only introduced it to a new generation.

She was long in the public memory. There were many movies and books that were released over the years that would introduce / remind the public of her history. Some examples:

Cavalcade (1933 film)

Titanic (1953 movie)

A Night to Remember (1955 book)

A Night to Remember (1958 movie based on the 1955 book)

The Unsinkable Molly Brown (1964 musical movie)

Raise the Titanic 1980 movie

In searching for a specific TV show I remember from when I was a kid I found a wikipedia list of TV shows and movies organized by year as well.

Of course her discovery by Robert Ballard re-ignited interest