I can't say for sure whether or not we would ALWAYS do the DDP. I do know that we plan to go to WDW every other summer for 10-night trips at BWV using our DVC points. What I also know is that for now, the DDP works very well for us. My youngest son is nearing 20 months old, and my big one is turning 4 next week. They are little, love character meals and that works out very well for us on the basic DDP. It only cost us $10 this past July for our older son to be on the plan. Those character dinners alone are around $13-15 each for a child that age when paying OOP. As for DH and myself, the plan works out well for us too. We are at those character meals anyway, and if we paid OOP we would have been between $25 and $30 for each one. Add in the CS lunch we would normally have anyway, and a snack each day which we would normally have, and it saved even DH and myself some money.
Some people do not like to have to rely on ADRs for their dining. DH and I (well, mostly I) are planners when it comes to vacation. I like to know that I have a spot in a restaurant. This is also why I prefer traditional dining on cruiseships, because I know I have a table in the dining room each night, as opposed to cruises that do not offer traditional dining anymore. Same concept for us. We also like to make sure to stick to our children's schedules as far as eating and sleeping go, or at least as much as we can. So we have breakfast early in the morning (in the room or the occasional character one), lunch between 11 & 12 and dinner ADR between 5 & 6PM. That keeps my kids on their normal eating schedule. We also love going to a TS restaurant to treat ourselves at dinnertime.
So what I did when I was planning our trip for this past July was look at the menus and prices online. DH and I discussed the restaurants we would like to take the boys to, and we also discussed how CS would be perfect in our touring plan each day. So we did the math according to what we would do if paying OOP, and the DDP was actually much cheaper. And that was even before factoring in snack credits.
I bring bottled water into the parks. I buy it here and home and take it on the trip down (we drive). We prefer to be able to snack around WDW so we make sure not to use snack credits on drinks. We use them on food.
Is the DDP a lot of food? Yes, there is no doubt about it. But we enjoy eating while on vacation. We are very health-conscious regularly and like to splurge while on vacation.
In July I didn't want to subject my kids (or myself or DH) to the heat at the hottest point of the day (2-3PM). So we got to the parks well before rope drop and left by 2PM. We saw everything on our list and even things I did not think we would have time to see. In fact, we did not even go back to DHS after napping at the hotel because we had seen everything and we relaxed with the kids. Same thing with AK. We left at around 1:30, and there were tons of people just coming in to the park. We were walking against the crowd!! At MK we had no problem getting back to the park on time for a 6PM ADR at Crystal Palace. We got there early and got seated early too!
DH and I are going to use the DDP again on our next trip as long as they still offer it in 2010. After that we will play it by ear but I can see us getting it at least until my kids are the adult price and even then it will depend on their eating habits. DH jokes around with me when I tell him I am not sure the DDP will be a good value once the boys are each 10 or older. He laughs and says, "you think a 10-year-old buy can't eat $40 worth of food in one day"? He swears they will be eating machines! Time will tell! Who knows? Maybe the deluxe plan will be a better idea if they still offer it when they are teenagers, so they an snack and eat all day!!!