I think the relative value varies a lot depending on the composition of your family or group, and your normal Disney dining habits. We have used DDE and liked it. There's no question it saved us money. One of the biggest advantages of the DDE (IMHO) is the ability to use it for up to ten people at one meal. If you are traveling with a herd of people, you get the discount for everyone. With DDP, everyone would have to choose DDP to get the benefit, and that undoubtedly would not work well for everybody.
Despite that, we are big DDP fans, and no longer use DDE. The last two trips we've used DDP and we'll be using it as long as it's available at a reasonable price to
DVC owners. One reason we like it is that we normally consider good dining at WDW an integral part of our trip, so every day we are either doing a nice TS meal or a character meal.
When I evaluate the cost of DDP, I do it very conservatively comparing the DDP cost only with what we
really would have ordered for our TS meals only. I calculate the value of CS and snack credits at
zero, despite the fact that we use them all. We still come out ahead, and if I assigned any value at all to the CS meals and snacks, we'd probably save several hundred bucks each trip.
I understand the reluctance folks like Chuck have about making ADRs months in advance, but that just does not apply to us. We enjoy the dining, and we usually eat a rather late dinner, so our dining plans are not an encumberance on our enjoyment of the parks.
In fact, I am much more comfortable knowing I have a dinner ressie. If our plans change, I can cancel; but if we go with no ADRs and we want to eat a nice meal, we're at the mercy of what is becoming a very unforgiving system. Particularly during free dining and during the holidays, there ARE no dinner ressies to be had at the last minute. On both of our last two trips, we saw signs at MK upon our arrival in the morning that there was NO TS availability anywhere for that day. You either have ADRs or you eat offsite -- and that's true no matter how you pay for the meals.
As far as the counter service options, that's really been a pleasant surprise for us. We never used CS before we got DDP, but we find the options varied and quite good. A few of the CS venues offer amazing values that could easily substitute for a TS meal if you were trying to save credits and double up for a 2 TS Signature Dining. Even though I don't count CS in our calculations, we get real value there. We usually hit them a little light and take one days worth home for food on the road. A stop at Earl of Sandwich on the way to the airport would be a wonderful option for anyone flying out.
I know many say it's a lot of food, but I have yet to have a server hold a gun to my head and make me order food I didn't want, or eat food I didn't want. I see people complaining about gaining weight on DDP (or on a cruise). I'm not a doctor, but I believe that's caused by actually
ingesting too much food -- not by the fact that the plan provides a certain amount of food. If I pig out on DDP, that's my bad, not the program's.