The DDP made sense for us when our kids were actually considered kids at Disney! The children's price for the plan is very reasonable - which helps offset the higher adult price. Plus, when they were young almost every table service meal was a character meal for us.
Now, it just isn't a financially smart option. My kids can not eat $60 worth of food per day inside the parameters of one TS, 1 CS and 1 snack credit. Especially when they are choosing to go to places like Beaches and Cream and Planet Hollywood for dinner and Kona Café for breakfast.
The other thing - I feel like on the DDP we ate so much more food than we would typically consume in a day. We would never eat a dessert for lunch and certainly wouldn't have a dinner dessert every night! So, in the past on the plan, we end up not ordering desserts (lost value), ordering desserts and stuffing ourselves (LOL) or taking desserts back to our room and throwing them away a few days later (because when do you find time to eat them when you are on a daily cycle of Disney overeating? LOL).
So for our family (myself, DH, DD17 who eats like a toddler!, and DS10), we pay out of pocket. Over a 11 day/10 night vacation, with 10 TS meals, we save over $600 total and approximately 10,000 calories each.