I've gotten past the shock of what we spend on food at Disney. We'll easily top $3000 for 3 adults, 1 Disney adult (11yo), a 7yo and an infant between the deluxe dining plan, a small grocery delivery to the room, and OOP tips for our 8 day/7 night trip.
Try running your numbers without the basic dining plan. (menus and prices are all listed on allearsnet.com) ..maybe you could save money by not doing the dining plan + OOP meals snacks + bringing food for a grocery store.
Or if it makes you feel better..when you break your expense down by day, you are only paying about $187 per day for all of you (adults) to eat at Disney. At under $50 a day per person, that is a really great deal when you look at the actual prices of the food around the World.