Disneyland
-TS: This one varies depend on my mood and the weather (really, yes, the weather). I like Blue Bayou, Cafe Orleans, and Big Thunder BBQ, but the latter two are outdoor venues, so those are only good on non-rainy/non-super-hot days.

-CS: French Market (NOS) is probably my favorite, followed closely by the Plaza Inn.
DCA
-TS: Carthay Circle and the Carthay Circle Lounge are my two favorites.
-CS: Flo's V-8 Cafe has pretty good options, but in general I've found DCA to weak on dining options.
DTD
-TS: Ralph Brennan's Jazz Kitchen is my favorite. We tend to go for Sunday brunch which features live Jazz music and a brunch menu (full lunch menu is also avialable).
-CS: Earl of Sandwich has lots of good options, but it can be slightly slow when really busy.
Resorts
-TS: Storytellers (GCH) has very good options, especially the Corn Chowder.
-QS: Tangarroa Terrace (DLH) has good options and a nice outdoor seating area.
In terms of mixing and matching CS options, it depends largely on what you're looking for. In DCA, you can probably find the widest variety at Pacific Wharf (it has Mexican for sure, not sure about vegetarian). You might have to walk to Paradise Pier area for the corn dog (at Corn Dog Castle).