Well... DDP is more expensive than the cranky mommy dining plan, which is what our last OOP attempt was dubbed.
I think they've finally engineered the value out of QSDP to the point that I probably can't break even on it anymore. I still might regard it as preferable.
I'm definitely even or better on the DDP, and while we're probably going to upgrade to DXDP for this trip, I ran the numbers for DDP, and we're definitely still ahead for the way we like to order. And it's definitely not too much food (I think the entire family would have to come down with cholera or something equivalent for it to be problematic to eat that much).
And this way it's paid months in advance, it's done, and we don't have to worry about it. It's not money sitting in the bank account ready to mysteriously disappear into some household expense so that we're worried about money when we're in the park (we don't use credit cards and we run on a very tight budget). Instead we get to do fun vacation eating and we don't decide it's a good idea to pack lunch in a cooler in the car and have kid's QS meals for dinner.
If the way you would actually prefer to order is a good match for optimal or nearly optimal usage, you can get value from it. (I'm not going to say "save money", because even not on the cranky mommy plan, we're just not going to pay out of pocket for everyone to have the most expensive meal on the menu and dessert.)
This isn't everybody, but not only is it possible, it's not necessarily a lot of work if your dining preferences match up well with it.