I cannot imagine 3 sit down meals which I think are needed to make DDP worth while. It takes lots of time to eat that many TS meals.
We do it and we love it. We actually look forward to our sit down meals. They are our much needed breaks throughout the day, especially with all the kids. Yes, there are times when we feel a bit rushed because something doesn't go as planned but we no longer stress it. Also, when I was nursing, I could relax, in AC, nurse, hide behind a napkin and my little one would almost invariably take a nap while I got to enjoy a relaxing sit down meal.
We almost always do a table service breakfast or one of the few buffets that we love and we book it early and then head into the parks. BTW - I too have lots of kids but they LOVE to eat and no matter what most restaurants tell you, they WILL let you order off the adult menu. My 3 year old loves lobster and ate it at every single restaurant that would let her and she did finish the whole thing.
You can sometimes skip a mid day meal or breakfast and instead do a Signature dining reservation instead which I think many families with multiple kids avoid, but my kids are awesome in restaurants and where else can you go to a really wonderful and "fancy" restaurant totally guilt free with multiples.
Some of our favorite meals for our kids and my husband and I are the Disney Play and Dine in HS, the Brown Derby (Signature), any of the a la carte breakfast restaurants throughout the hotels (the food at those restaurants are AWESOME), if you go during food and wine you can use all your snack credits at the kiosks, Cali Grille (my 8 year old devoured my plate and her sashimi appetizer), Narcoosees - great lobster and crab cakes, Cindy's castle has a great breakfast, the dinner isn't as good as it used to be but a wonderful lunch break in MK, AK has Yak & Yeti and then we go somewhere else at night for a signature mean (don't get me started on Tiffins), and we love Monsieur Paul at Epcot for dinner. We find it works for us but we go to Disney to eat as much as we go to ride and play and relax.