Wouldn't it be funny if Terrible Trouble at Tragidore (the adventure with the 2E DM's screen) was the most played adventure of that era?I can't think of any 2e modules that got nearly the airplay that a lot of the 1e-era ones did before and some key 3e-4e-5e ones did since.
2e, for all its good settings and other material, really was a wasteland for adventure modules.
And I suppose somebody should at least mention them: the Judges' Guild modules Dark Tower and Caverns of Thracia are two more of the few dozen modules in outer orbit around this discussion.

2E does have a few adventures that come up in conversation (e.g. Night Below, Dead Gods), but they tend to be massive campaign adventures that likely weren't played by that many.
It's definitely worth mentioning the Judges' Guild modules, though I have a suspicion they're much more influential amongst designers than widely played. (I have physical copies of neither. Argh!)
Cheers,
Merric