I don’t know how many times I’ve watched Psycho (1960). As a teenager, I even watched it with subtitles, twice: On my Canadian province’s mandatory French channel, and then, in a Paris (yes) hotel room. It’s the only thing I remember about that entire trip. (I am a very strange person.)
I never found Psycho scary. I feel the same way about The Exorcist (which is basically just The Searchers with vomit) or most of the usual All Time Most Frightening Films.