"Ferris Bueller's Day Off" is my favourite. Obviously "Platoon" is a better movie, but it's just not one I'd ever want to watch again. "Bueller" is endlessly re-watchable though. '80s were my favourite era for movies too, even though technically I grew up in the 90s. I was too young in the 80s to appreciate most of the great major movies and cult classics that came out in the period, but over the past ten years I've been discovering and enjoying them consistently.
I just watched "Aliens" for the second time recently, and I really don't think it's held up so well. I used to have trouble deciding which one I liked more between the first two, and now I think the original is far superior. There's nothing really wrong with it per se, I think I've just come to find it has too much action, not enough character for my tastes.
I think the characters were a lot more broadly sketched than in the first one (especially one-dimensional evil corporate asshole Paul Resier, and one-dimensional whiny coward asshole jock Bill Paxton), and the action just isn't as timelessly thrilling as it used to be (unlike in Cameron's "Terminator 2: Judgment Day), although I'm still impressed by the movie's technical merits (it still does have some of the best-directed action committed to film, even if its magic is wearing off on me) and the intensity of Sigourney Weaver's performance.
I just saw "The Fly" for the first time this year and was blown away by it. Amazing special effects that haven't aged a bit and unforgettably loopy, yet somehow plausible twitchy and nuanced man-turning-into-beast performance by Jeff Goldblum...the best performance I've ever seen from him. I'm surprised there isn't more love for "Hannah and Her Sisters" here. I just watched it again and though it's not quite as perfect as "Annie Hall" or "Manhattan", I think it's one of Woody Allen's most philosophically clever and emotionally resonant movies and one of his last truly great ones (not that he hasn't made any excellent ones since). I can't believe how convincingly Michael Caine played a serious role in that movie...I've got so used to just seeing him as comic relief.