I saw it, before it fell, as a student in 1985. I also got to visit East Berlin. I remember noticing large paved areas, as I walked around, areas that looked out of place, as though something should have stood there. Then I realized that I was looking at sections of city blocks that the Communists simply paved over, because they couldn't marshall the resources to restore or replace the war damage. Silent testimony to the failure of that worldview.
I also saw a rally of the "Free German Youth" blueshirts. "You may not stand with us, but your children will!" As true for the Communists, as it was for the Nazis (after all, they are ideological cousins.)
I also was amused by the East German guards and border personnel, who were visibly irritated by green Jägerrock that I wore (surplus from the Grenzschütz and my Bavarian accent, but who found they couldn't stop me, when I showed my US passport. Bloody Prussians!
Their beer was awful, too. No "People's Own Enterprise" could compete with ours in the West. (I trust it's gotten better.)
Prost!
Brad