Our family has only used the DDP twice. We found that for the way we prefer to eat, paying OOP saved us more money, and we were able to eat whatever we wanted, wherever we wanted, without having to follow "the rules". Really, the only way to save money on the DDP is to eat at all the character buffets or to order the most expensive items on every menu. And the old excuse of how convenient the plan is doesn't wash either. Paying OOP by swiping your MB is no harder than swiping your MB to use the plan.
We aren't big breakfast eaters, so we eat in our room while we get ready for the day. We make a grocery stop just before checking in.
We do one CS and one TS per day. Since many restaurants now have all day menus, there's no real cost savings of doing a TS lunch over dinner any more. The exception are the buffets and AYCTE restaurants. But I suspect this is going to change to the same price for lunch and dinner, too. CP has just implemented this.
We will often share a CS meal, with an extra side, since the portions are so large. At TS meals, we will usually share an appetizer and dessert, but each get an entree. Or, if I'm not very hungry, I might only order a couple of appetizers. My sister often orders a kids CS meal, since she has a small appetite and is quite a picky eater.