I have been thinking about the free dining scenario - consider the costs/savings for a couple staying in a moderate resort.
The cost to upgrade a meal plan from
DDP to DxDP = $46.28/night/person
Now, having twice the number of DDP credits isn't exactly the same as having the DxDP, but it is pretty close. A party of two, with 4xDDP would have 4 snacks, 4 QS and 4 TS meals/day to share. They could easily meet their dining needs with that many credits - even if they like to splurge a few times/trip. And each member of the couple would also have 6 FP+ each day instead of 3. All for about $36/day/person.
So, eat anywhere that you want and double your FP+ reservations for the cost of an extra ticket per person. Pretty sweet deal.
This should go in the FP+ planning thread.