I liked reading Charlie Brown far more as a 7-8 year old than I do now. I didn't have to understand it, I would just keep reading those little books until something made me laugh.
I thought the "moon is a baseball" was hillarious. I was fascinated by Snoopy's brother. I had a real appreciation for the different personalities, even when not understanding what they were saying, though I don't remember that bothering me at all. I got in trouble for telling my 2nd grade teacher that global warming was just like Lucy thinking the earth will get shrunk by walking on it, so I did pick up on that satire of doomsaying scientists (that teacher legit hated my guts for reasons beyond my control).
I thought some of the really lame and shallow strips were funny that I could never appreciate now.
I also just got a joy out of reading anything contained in speech bubbles back then.
When I got some Calvin and Hobbes comics from grandma when I was about 9 years old, I spent weeks reading them and rereading them. Peanuts seemed quite a bit duller after that and I rarely read them.