I like Thomas the Tank Engine. I started watching the show when I was very young (My retainment of knowledge about the characters and even memorization of certain episodes were some of my first signs of AS!) I rediscovered the show through the internet about a year ago, and now I feel like the years I spent without it have been some of the worst in my life.
Other than that, some of the old Nicktoons I watched when I was younger I like. Recently a friend introduced me to a cartoon called The Tick, and I'm hooked on that now as well. There are also the Mario cartoons from the '80s. I've seen a few episodes of a relatively obscure children's series from the 1980s called TUGS, which was filmed similarly to Thomas, but had longer episodes, multiple actors, and somewhat darker themes. It is a very enjoyable show.