Nah, I rewatch stuff sometimes. The thing is, you have to realize that even if you don't remember now, once you start watching you'll probably remember more than you realize. Twists won't be a surprise. And if the enjoyment of the movie depends on the twist...that's bad. Like Sixth Sense. Worse, is most twists have heavy foreshadowing, so you'll be double reminded.
On the other hand, rewatchign with knowledge can be fun. I actually DID rewatch Sixth Sense instantly as soon as I finished it the first time to see if the show ever cheated in it's twist (It didn't).
But also, you get a nostalgia kick out of it. You know you LIKED that show, so rewatching is like putting a familiar comfy sweater on.