Yeah, at MK, Columbia Harbour House is a favorite of ours. There are a couple options, even if you don't like seafood, but my favorite thing about it is eating upstairs. Love to get a table upstairs that overlooks both Liberty Square and Fantasyland. It's nice and peaceful up there, you can find an outlet to recharge your phone. Our little guy took a little nap up there while we ate on our last trip.
The ABC Commisary gets a lot of flack from some folks, but I've never had a terrible experience there. It's a nice place for families, for one, you can get a decent size table and eat generally at your leisure.
Harambe Market in AK is pretty cool, though I haven't spent as much time in that area as I have in other parks.
Epcot is just full of great little places; The Fish and Chips stop in England is pretty great. (Yorkshire County Fish Shop)... I've never stopped at Electric Umbrella, but in general I feel like if I'm at Epcot, I'll go for food that's a little different than standard theme park fare.