As with all the plans, it works best when you're already planning on dining in that fashion. I also try and temper expectations all around and make sure that people know what they're getting into (time commitment, amount of food, and associated costs being the big three). Many people don't prefer to dine as it's designed, and that's absolutely fine. I, personally, do.
I've used it for the past 3 trips and enjoyed it every time. I, too, prefer the TS options to the CS meals. I'll eat CS if I have to (and, I gotta say, I loved the meatballs at POFQ's food court this time around. They weren't pretty, but they were tasty), but I generally prefer a nice sit-down. I also enjoy both the apps and desserts, and often use them to try things I normally wouldn't (e.g. Scallops at Maya Grill, Wild Boar at Jiko, Creme Brulee at...well...everywhere (last year was the first through tenth or so time I had it
)). I also have realized that it's typically more food that I need, and as such, will leave portions uneaten. I know, I know, the starving kids in Africa, but it's not my fault there's only one size option
(I'd be a big proponent of knocking most serving sizes down by about 33% and knocking 25% off the prices).
Now, with all that said, will I be using it next trip? Probably not. The changes in pricing may have made it not so worth it for me. As it was, my savings was relatively lower than others (especially since I travel solo) and adding another ~$15 per night is likely to wipe out said savings. Plus, next trip may be offsite (I know, I know), so that precludes me from the plan anyway.
In the end, it's about finding the plan that fits you right. If DxDDP works for you, then great, if not, there's other options (TiW (potentially), other plans, OOP, PB&J).