On our first Disney trip, the kids were pretty young (1&5). We didn't do any of the evening shows or fireworks. Instead, we'd head home, drop the hubbies and kids at the condo to make the kids' dinner, and my sis and I would go to Goodings. They had a GREAT selection of pre-made dinners, which just needed a brief heating in the microwave. They weren't cheap, but we could feed 4 adults dinner for under $30. No leftovers, of course; these were individual, refrigerated meals, but it was nice that we could each choose what we felt like eating- and it was cheaper and faster (with kids in bed earlier!) than if we'd eaten at restaurants every evening.
By the second trip, we'd learned better how to "do" Disney, and the pleasures of the evening shows, parades, and fire works. We stopped at Goodings to buy our condo food- breakfast stuff, park snacks, condo munchie stuff, drinks, etc. We were appalled at the overpricing at Goodings! We use Publix now, on every trip. Of course, we now eat most of our dinners in the wonderful table service restaurants!!
Another good place for take-out is Olive Garden. Call in your order as you leave the parks and it's usually ready by the time you can get there to pick it up. It IS nice to have a relaxing meal "at home" rather than in a restaurant after a long day! (We either bring take-out menus from our home branches of the chain restaurants, or look up their menus on-line).