Tell me what type of food you are thinking and what area you are staying (192, 535, on Dinsye etc), and then I will be able to help you out more. As Im sure you know, there are TONS of restaurants in that area.
We're looking for a place to each lunch on T'giving when we drive to the airport from Windsor hills to fly home. Anything that's filling and cheap would be great for us!
Cracker Barrel actually offers a pretty good turkey dinner on Thanksgiving day. I think it is around $8 for adults. Kids are probably around $4. there's one on 192 not for from WH, but I have no idea if it is a "good one" or not. I'm sure there's at least one more between WDW and the airport.
If you'd like to eat at a WDW restaurant, just walk-up when it opens and put your name on the waiting list. We did this last T-Giving at Ohana's -- and they took a couple dozen walk-ins.
I've had Thanksgiving twice at the Beach cClub's restaurant Cape May Cafe. Last year I know for certain they did not take "exclusive reservations only" so walk-in tables were available. And the Thanksgiving Buffet was very good.