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speaking as one of the "older" people, i was about 13 when i saw alien and i remember getting scared just hearing all the screaming going on during the show before, and actually running to the back of the theater during the movie, where a couple of other people were. The screen seemed even bigger from there but being with a few other scaredy cats made it easier. lol
hard to say if things were more scarier then or that its become so "in your face" that we've all become jaded. . . but then, when done properly, i still can get scared, so. . .
oh, and aliens was an adrenaline pounder back when it came out as well