We (me, DW, DS11, DS9, DD4) are booked on the 4/3 deal. I added DDP for three reasons.
1 - I wanted to have at least 2 character meals. CBs really mess up touring plans as they prevent us from getting to parks at rope drop. Dinner character meals are more affordable using the DDP. With DDP we will end up with about 5 character meals.
2 - I guessed what meals for the 5 of us would be if we ate OOP, including offsite for meals. I planned for $100 a day for the 5 of us. The DDP is about $970 I believe, so it was only $150 more then OOP. If I tried to feed the family on $100 a day there would be times where I would feel like we were skimping. I don't want to be glutton, but I would rather have my food budget paid for an not worry about if the family is getting enough to eat.
3 - Time is money. Even though I will have our van, the time it would take to eat off property and wait in lines off property are a big factor in choosing the DDP. Figuring it costs $600 a day to be in Disney, and we have about 12 hours of Disney time each day, each hour is worth $50. If it takes two hours to go off site to eat (that's optimistic I think), I doubt I will save $100 on my OOP meal since the DDP only costs me about $140 a day.
I'm under no grand illusion that Disney food is sooo much better then anywhere else, but the overall value of the DDP is worth it to me. I can't say that the FD plan will result in the same time savings since so many people will be eating on property.
Oh, if you plan to go off property for side trips, my theory doesn't work either because you don't save any travel time. My last trip 3 years ago, we planned to be out out of the park several times. I probably spent the same amount of money on food, but it was more convenient to eat when and where I wanted to.
Just my 2 cents