I don't think I could narrow it dow to 5 top favorites.
There are too many in ANH, the Stardestroyer flyover is one
I concur completely with regards to
Star Wars (before the not-so-Special Editions, that is). Every scene is a favorite for me; despite the many many many times I've seen it, it still only takes a moment and I'm hooked like I was the first time I saw it in 197
7.
So that's one. Some of my others are...
Jaws. The Indianapolis scene is a standout, of course, but I love the entire movie.
Frankenstein (1931). The sequence that begins with the first time we actually see the Monster as he backs through the doorway, and ends with Henry Frankenstein and Dr. Waldman restraining the Monster after Fritz enters with the torch. Boris Karloff owns this scene, and in my opinion he is the only actor to every convincingly play the Monster as a sympathetic being, as much victim as culprit.
Unforgiven (1992). One of Eastwood's best movies in my opinion, but the most memorable moment for me comes down to one line. In the scene between The Schofield Kid and Will Munny after The Kid confesses the man he'd just shot and killed was his first, and Munny says "It's a hell of a thing, killing a man; take away all he's got, and all he's ever gonna' have."
I know there are others, but they're not coming to mind at the moment.