We used the DDP on our trip in January (our family's first visit) and we are glad we did.
We enjoy eating out as a family so it was nice to experience all the places around WDW. Also, it allowed us to eat in places we normally wouldn't--like all of the character meals.
We found that by eating the table service meal at night, we maximized our $$.
Secondly, we have child with a peanut allergy. We found WDW restaurants MOST helpful and safe in explaining the dining options.
We plan on using it again on the next trip and try more places to eat.