My personal favorites for counter service/quick dining are:
Disneyland
Rancho del Zocalo. Consistently good food over the many years we've gone to Disneyland. And will definitely fill you up.
Alien Pizza Planet. OK, I know this may be an unpopular opinion, but I actually dig the giant pizza slices, and the pastas are tasty and filling. On a lighter day, the salads are actually quite good, too. So if you're crew is starving and you don't want to have to hoof it to Frontierland, APP is a safe bet.
River Belle Terrace (get on walk-up list). Pulled pork sandwich is "da bomb." Paired with a house salad, c'est magnifique. Not sure if we'll be able to get in here on our next trip, since they started taking reservations and I'm not sure how successful we'll be on the walk-up list, but it's worth it if we can swing it.
French Market. New Orleans Square ambience, often with live music, and as an alternative place to Blue Bayou and Cafe Orleans the creole/Cajun choices are quite tasty.
DCA
Boardwalk Pizza & Pasta. Have never had a bad meal here, and it's usually not overly crowded due to its location on the backside of the Midway.
Cocina Cucamonga Mexican Grill. Think Rancho del Zocalo, but with a peekaboo water view and a nautical ambience.
Pacific Wharf Cafe. Can't remember what we ordered here, but my entire family remarked, "Why haven't we eaten here before now?!"
Bon appetit!