Well used to love watching dexters lab, johnny bravo, cow and chicken lol so many i cant name all. I used to love nickelodeon too though. Obviously this is going back 15 years ago lol did you mean who still watches?
When Cartoon network was at it's best, I used to watch a lot of good things, even before going to school;
Ed, Edd, Eddy (unsure if that is how it's spelled), Ben 10, Courage the cowardly, and, other stuff that I can't remember the names of.