I don't go out of my way to watch them, if there is nothing on normal channels then I look at the kids section to see if there is any nostalgia inducing cartoons on.
Most notable one recently was Rugrats

Fairly Odd Parents
Pokemon (Still trying to find the original series)
I can mind seeing Digimon on once.
I miss Dexter's Laboratory - that had to be one of my favourites when I was growing up and when I was at my grans

- Watched MLP twice, maybe 3 times, but it's not something I'd do unless I was really bored and had nothing else to watch or do.