I echo what everyone has said - way too much food! I went in Aug with my 24 yr old son (big eater!) and my 22 yr old daughter. We had the "regular" ddp with 1 qs and 1 ts daily along with 1 snack. We had so much leftover food. Granted we always substituted the "dessert" at lunch/dinner (which has now been eliminated for 2017!) for another side, and often substituted the drink for another side when we ate at our resort (we used our refillable mugs for our beverage), but still I couldn't imagine it not being enough food.
I agree with another poster who said they like the deluxe plan if trying many signature restaurants (that require 2 ts credits each) but my "kids" weren't even interested in that kind of high end dining, let alone a 6 or 9 yr old wanting to go to a lot of "fancy" restaurants.
We also bought breakfast food, drinks to bring into the park, and extra snacks at a nearby Walgreens. The only thing we used were the drinks and bagels with cream cheese that we grabbed on our way out each morning for a quick breakfast on the way to parks.
Two of us split a large combo meal at Flame Tree BBQ (QS) in Animal Kingdom - great food and huge portions.
Two of us split a chinese lunch buffet at "Seasons" (or "Sunshine"?) food court in Epcot (it's the one in the "Land" building, by Soarin.
Snacks were often huge cupcakes that 2 people shared or things like egg rolls at quick-serve in Epcot.
We never used snack credits for drinks - it's a waste of a snack credit - we paid out of pocket when purchased but we took advantage of the free cups of ice water at all quick serve restaurants and didn't need to buy too many.
We loved the dining plan because it allowed us to do so many character buffets that we couldn't have afforded without the
free dining perk. We were always over-stuffed though after every buffet
Enjoy!