All of my friends and family rewatch movies. Acquaintances from work will recommend movies they move to rewatch. It is really common in my experience, although I do have one friend who barely watches movies and if he does it is only once.

I have ADHD and miss details, a lot of details. If I enjoy a movie then it is likely that I will rewatch it if I am not particularly focused to keep up with a new movie, and I tend to find lots of little things I missed or notice things in the background.