The guys that aren't jumping during theses films., are you doing what I used to do, which is sit through the whole film thinking "there's a jumpy bit coming, be prepared." Then when it comes, you have expected it and it doesn't have any impact.
Having that attitude ruined a lot of alright films for me, but since watching a few foreign horrors and having to read the subtitles my mind was taken off the "jumps" and I started to enjoy them again. Now I just switch off and don't expect anything, makes watching them much more enjoyable. Having said that, some films are just do damn predictable.