Re Watching the classics

I am a avid TV watcher both now and then. I just recently watched the chappelle show after I want to say 3 years of never seeing it and I am laughing at it like its my first time. Not every show can be watched over and over again to the same effect. But the time between watching is different between shows i have noticed. Shows that rely on jokes that have HUGE payoffs like sketch comedies(mr show,snl,chappelle show etc..)or seinfeldesque or Simpsons show where the punchline is pop culture in itself. Shows like star trek and dramas are infinity hard to rewatch as the crux of the show is the beginning and the end and the suspense of getting from point a to B. Knowing what will happen up front kills the suspense for me making the show hard to get into a second time. I figure any show that is awesome should be least ready for reviewing in at least a year and gets better every year after.