For July 10 trip, I priced the
DDP out based on where our ADR's are for the TS using an average meal cost for that place, and figured in $3 per snack credit and $8 per cs (2 adults, 3 kids).
Our ts (all dinner except where noted) were: Momma Melrose, Donal'ds Safari Breakfast, 1900 Park Fare, Akershaus, LeCelier, Chef Mickey's, Boma. These are more expensive per plate, then most 1 ts places on property.
Cost oop for this would have been $1,427 - the dining plan added $930 to our trip. That's a 34% savings over cost.
In 09 we did DxDP - I didn't price that out, but I doubt the savings was this high - we used 2ts credits for dinner and ended up eating at some cs lunches, so I dont think Dx would price out to as much of a "value".