Love the food courts at both Port Orleans resorts (build your own pasta bowls at POR are a must do), love CSR's food court, Gasparilla Grill is wonderful, Captain Cooks at the Poly is a favorite of ours and we also enjoy the Contempo Cafe at the CR.
If you want a table service lunch that won't break the bank, Olivia's at Old Key West is wonderful. Nice sandwiches and salads (they have a cuban sandwich that I love) and its an easy boatride from DTD. Lovely resort to wander around and enjoy and Olivia's has nice outdoor seating with a bit of a view of the marina as I recall and the ceiling fans and shade make it very pleasant.