Well, I didn't witness it first-hand, either, because we were already living in Munich at the time, having left the GDR one and a half years before, but of course it's tied to my personal history. I remember that when we left the country, I looked out of the window of the train at the nightly snowy landscape outside (probably Thuringia) and thinking I'd never see the place again. As a consequence, I felt like I didn't have a real home for years afterwards. But not even two years later we could return there (though we only visited and it didn't really help with the feeling of not being home anywhere but that's a different story). The fall of the wall and reunification are the mightiest reminders I know that sometimes, dreams do come true - even those that almost everyone had given up on.
As for Goodbye, Lenin, the story of the son just resonates a lot with me. The GDR appealed to people's noble ideals in its propaganda and many believed in it at least partially even though at no point there was any intention to live up to it. In the movie, he and his friend create the version of the GDR that we all wanted it to be but that it never was. In a way, it feels like my story, although that probably doesn't make any sense to anyone reading this.