The only AP class I took in high school was English bc I love English and didn't feel like working too hard in anything else. haha, it didn't matter I still got into a really good college. The only thing I wished I'd taken more AP for was credits because then you don't have to worry about meeting the reqs.
ANYWAY, my English AP was actually really easy and I ended up with over a 100 GPA because it gets weighted. It depends on the teacher I'd say. There was a lot of reading compared to other high school English courses I'd taken, but nothing like college. Once I was actually in college I realized how much more work it was. I don't even remember doing work in high school, but there are some projects & things I did in college that I know I'll never forget. I'm glad I went because I definitely learned a ton.