There is a difference between how people watch stuff and how much they remember. I also can't rewatch anything within a decade, because I remember every single line. My wife didn't remember what that episode was about a week later. Sometimes I envy her, because I constantly need to look for new stuff, which might or might not be good. she can just rewatch something and she knows that she likes it. Of course this is exaggerated, but I guess you get the point.