We did the QSDP last trip, and it was wonderful - ended up with many credits left, which we converted to snacks for DD to take home (some are still in our pantry - so buying the plan obviously wouldn't make sense for us!).
Breakfast - most days for us was coffee in the room (I brought a single serve travel coffee maker as we were at Pop). And some snacks. One day I got a breakfast platter that we shared.
We did do BOG breakfast an hour prior to the park opening. The pro was we got to ride so many rides! And it was covered under the dining plan! The entree was quite delicious to her! Con: I wasn't feeling well, so we shared one meal (I couldn't eat - tummy issues from polishing off a treat from Goofy's Candy Co the night before). Also, having to get up so early isn't our idea of vacation. If you have the QSDP and want to do it, I highly recommend it, but do it when you can get in prior to park opening.
BOG lunch - if you can get it is wonderful! DD and I did that - out of what we got (we each got a soup and entree and drink) the roast beef sandwich and French onion soup were so great! It was way too much food, and I am sure it would have cost well over $50. We literally left half our food on the table. It is a lot but so good!
We love at DAK Yak & Yeti - we always share an order of the honey chicken plus a side of fried rice (and often an egg roll). It's a lot of food! We love it!
Epcot - oh dear the choices are endless.
DHS - honestly not my favorite. There are choices - just look at menus. Just remember you can take a boat or walk to the Boardwalk if you want. It's hard, since many are closing (like the Writers' Stop).