We're a family of 5 2 adults, a 5 yr old, almost 4 yr old, and a 15 mos old.
We get the DxDP every trip.
First, we like the time to sit down in a quiet, ACd area for the kids, we like the characters, we like the food better.
I know most ppl say if you use it for any QS it isn't worth it, but no matter how i plug the numbers in, we save a heck of a lot more getting the DxDP than we would on any other plan or paying OoP, or TIW etc.
We do usually get an appie and a dessert. Not for every person, but to share (and even doing that we come out 'ahead').
We dine at 2- signature restaurants per trip (or dinner shows). We also do most of the character dining experiences. Our children are NOT picky eaters so are happy trying ostrich, quail, duck, various seafood etc.
We buy a lot of snacks while on vacation whether water (gotta stay hydrated), icky BArs, Dole whips, or fruit.
We tend to have fruit in the room for BF most days just to tide everyone over until we sit down to eat, or get to the parks or whatever. Also if the kids wake up early we'll pop fruit into them, go swimming before BF.
The question is: do you like to eat? Do you tend to try new foods, or stick to 'American' fare? Do you want a break front he hustle and Bustle?
Oh when figuring in what's better for us we look at QS - we'd end up eating almost the exact same meals every meal/every day.

With DDP we'd end up having to pay OoP for at least 1 meal and would be limited on our snacks (no way I'm paying $4 for a water, but certainly need to drink). There wouldn't be an appie - thus the girls would get more antsy waiting for food. there would be less tips.
With DxDP - we have higher tips, but higher quality food, more variety, more snacks, we can eat what we want, when we want, even if that means nothing at all for lunch one day, or just a single personal pizza for ally o share (it happens). But we can dine at Jiko, SoA, CRT, and Citricos all in one trip without having to pay OoP for them. We do have to plan our meals a bit more, but we're pretty good at knowing when our girls like to eat. We usually take that time, push it back an hour and make our ADRs accordingly. So they eat lunch at 1, we make ADRs for 2. Then at noon we stop for a good snack and head toward our ADR location. This way they're ready, but not ravenous. We get there just early enough to be seated on time, and get our meals. They relax, and we talk about the day, and what we want next.
Certainly there are times when they're hungry NOW vs in an hour when our ADR is, but we find a QS wouldn't actually be that much faster since we'd still have to wait in line, but snack carts are usually pretty easy to grab something in a hurry. And then the appies come out and they're good until heir food comes.
So time vs money vs amount of food = DxDP for us.
ETA: with a toddler eating off our plates we also find it's nice to have large quantities of food.