Yes, I still watch this show, and I'm 15. But I enjoy it a lot, especially when they do songs. I always get up and dance like a goofball, because this show sets me free and reminds me of my lost childhood. I also enjoy sweet, brainy Cassie...she's so like me when I was young.
On a practical note, I watch this show because someday I want to work for cartoons in some way, and think that it's all little kids working on these shows? No, it's adults who want kids to have good, educational television. And that's why I watch it!