You're not doing something wrong...but if you are eating out all your meals and only on Disney property, Disney has jacked the prices up so much that you will pay an arm and a leg for that privilege.
If you want to have a cheaper vacation (especially with meals), you'll want to figure out how to adjust that down through a. eating meals in your room/cooking at an offsite location, b. eating meals at offsite restaurants, and/or c. eating meals the cheapest way at onsite places.
If I were you and looking for a cheap way to do a 2 week vacation for 5 in the summer, I would look for an offsite condo for 5 (and give it a high number, like $850/week for $1700), groceries for breakfast/dinner/snacks ($300), tickets ($2200 - this is the killer cost), parking ($240 for 12 days at parks) and 1 onsite CS meal per day ($70 day or $980 for 2 weeks). That gives you a total cost of approx $5400ish before you figure in travel costs (which are cheapest if you drive)...less than 1/2 of what Disney is looking to charge you...