To the OP - I can understand not wanting the DP for many reasons. Here are just a few:
#1) If you are an "over-analyzer" and will be constantly worried about getting your moneys worth then it could detract from the vacation.
(Hmmm, I'm too full for dessert but I really should get it....)
#2) You are on a tight budget and it is less expensive to book a deeply discounted room and bring your own food into the parks and/or your hotel/condo. Disney may discourage this but we all know many, many people do this. For instance, we usually bring our own water bottles into the park. I'm sure you could save money by avoiding all or most of the WDW restaurants or just eating your own snacks and going to CS restaurants and splitting meals. This would probably add up to less than the dining plan.
#3) You want to do TS meals 2-3 times a day and would not use any of your CS credits. (I can't imagine not using the snack credits even if it is just to buy bottled water.)
#4) You eat at a CS and TS everyday but order very conservatively (no appetizer, dessert etc...) or split meals. If you do the math it may come out to being less expensive paying OOP than on the DP.
As for me:
We will be using the DP for the first time this August and we're excited about it! We are a family of five so the
FREE dining promotion was great for us. It will be an "all-inclusive" Disney vacation!
We plan to just use the credits as we need them with no big OOP strategies etc... We made ADR's for the TS places but we always do that anyway. The CS and snack credits will be used day-to-day and we won't worry about it.
We try to eat healthy and have noticed it is getting easier and easier to do that at WDW. Most places have salads (get the dressing on the side) and lots of the kids meals come with fruit instead of french fries etc... I'm not quite sure why people think the DP can't be healthy.

We may choose to share appetizers even though we are each entitled to our own. I don't care if I don't spend all the $$$ that I can. I just want to enjoy myself.
For those worried about dessert everyday - skip it - or request a bowl of berries or a small scoop of sorbet. Maybe you can get a fancy coffee like a capuccino or a latte instead of that chocolate lava cake.
With regards to the snacks being unhealthy - you can get bottled water, fruit, yogurt etc... There are more than mickey bars to choose from!