Probably not the time period you're looking for, but most of Goodbye, Lenin takes place in east Berlin at the time the Wall came down.
I don't want to give too much of the film away because it really is wonderful and you should see it, but here's a brief synopsis:
The story is told from the point of view of a boy who comes of age in 1989. When he was a child in the late '70s, his father had escaped to the west leaving him, his sister and mother behind.
After the shock had worn of, his mother transforms herself into a tireless apparatchik for the party. In Oct 1989, she sees her son arrested and beaten by police during a demonstration, suffers a heart attack and falls into a coma.
During the eight months she's in a coma, the Wall comes down, Germany reunites, and east Berlin begins to rapidly transform.
Once the mother comes out of the coma, her doctors warn her children that she needs to avoid any kind of shock, or she could have another heart attack.
This leads to increasingly farcical attempts by the kids to hide from her the fact that the GDR was no more, and the system that she had dedicated so much time and energy to had completely disappeared.
Obviously a major theme is the contrast between life in east and west Berlin, both on a superficial level, and with regards to the deep psychological effects living in east Berlin had on people.
EDIT: Thinking about this film earlier made me want to come home and re-watch it, and so I did. It's even better than I had remembered.
By "deep psychological effects," as I mentioned above, I'm referring to the overriding theme of the film, which is deception. Characters in the film (two in particular) go to great lengths to hide the truth from those closest to them, but they don't deceive for personal gain but rather to protect their loved ones.
I lived for close to eight years in what is now Czech Republic and Slovakia between 1991 and 2003, and traveled extensively through those countries, as well as Poland, former East Germany, Hungary, Croatia, and Slovenia. The stories I heard were very similar everywhere I went.
That is: There was a general understanding that those states were built on lies, and even though everyone knew the lies, they also knew the consequences of challenging them.
The most important lesson from this film is that when one lives in a society held together with lies, one's own lies can be an act of compassion and love.
Again, I don't want to spoil the film for anyone who hasn't seen it, but this theme of dishonesty as means of protecting one's self and one's loved ones was very common in all the stories I heard from people throughout the former Warsaw Pact.
Could you be more specific? The question could refer to the immediate aftermath of the war, the period of separation (ca. 1948-1988) or the rush to German unification. Each period will focus on certain aspects of the German experience and their cinematic approach towards daily life will differ accordingly.
"The Lives of Others" comes immediately to mind. It's set in 1984 and centers around the Stazi monitoring of a playwright in East Berlin. I don't want to say much more about the plot as it's an incredible film, I really recommend it if you are interested in this subject.
Some elements it covers on living in E. Germany:
EDITS: The film won the "Best Foreign Film" Oscar at the 2006 Academy Awards.
Hmmm, here are a couple of articles that dispute the accuracy of the film, mainly that the main Stasi agent in the film (a sympathetic character) would not have been possible. http://www.theguardian.com/books/2007/may/05/featuresreviews.guardianreview12 http://www.nybooks.com/articles/archives/2007/may/31/the-stasi-on-our-minds/?page=1