We've done no discounts, the (old style) DDP, the DxDDP, and the TiW. We love good appetizers, so we wouldn't ever pay for any plan that didn't include them. We much prefer them to desserts, and not including them on the DDP keeps us from buying it. And we're not getting any dining for free now that we are
DVC members. So no more DDP for us, at least in its current form.
Traditionally we eat breakfast in the room all or most days, then do either a TS or QS lunch and a signature restaurant for dinner. In the old days, we generally paid for a few TS meals out of pocket, since we really prefer TS to QS most of the time. Then we'd get a bunch of food for the road at the last day to use up our snack credits and our remaining CS credits.
The DxDDP was actually great for our style of dining, and we may yet decide to use it again. However, we opted to get the TiW for the first time this year, and we have absolutely loved it. We know it has saved us money; it paid for itself with one meal at V & A's.
I don't know if we'll ever go back to no discounts. We enjoy many of the dining experiences at WDW, particularly those that really cannot be easily duplicated even in a large city with many dining choices. (Cali Grill watching fireworks, Jiko, V & A, Bistro de Paris, Coral Reef dining by the tank, Marrakesh, Cindy's Castle, even Sci Fi) No, the meals aren't always all about the food, but we found the experience of those meals worth our time and money. TiW seems to be the best fit for us, with the DxDDP a very, very close second.
As far as recent changes to booking dining go, I'm actually glad you can't have two ADRs for the time slot any more, but I'm very sorry you can't book at 180 days out any more.