yeaaaaaaah. sure there were plenty of people doing it. 2 years ago there was a german king of the road thing and one of the missions was to do a berlin-wallride. i heard that one of the slap pals favourites has stuff in an upcoming video on that thing (i don't gonna tell a name because that would be my death ... haha). it would be interesting if there was something done before 1989, especially on the east/communist side.
edit: i gonna scan some pictures today, if i can find the mag here.