been a number of threads on this so if you don't get a lot of responses you can do a search on CS on this thread.
MK - Columbia Harbor House for something different; Cosmic Ray's for wide variety, entertainment and the fixin's bar; Pecos Bill's for burgers (again witha fixin's bar) and a pork barbecue sandwich.
Epcot - Sunshine Seasons has a wide variety of food and the quality is very good; Tangierine Cafe; Bratwurst at Summerfest in Germany and fish & chips at UK.
DHS - not many great choices - we usually go to Backlot Express or Studio Catering. I have read good things about Fairfax Fare but haven't been.
DAK - Flame Tree Barbecue and Yak an Yeti CS.
DTD - Earl of Sandwich and Wolfgang Puck Express.