While many of QS restaurants are blah and redundant there are some superior choices within Disney World that rival some of the table service offerings.
Columbia House, eat upstairs - MK
Mara, AKLodge
Captain Hook's at the Polnesian has excellent full breakfasts and amazing lunch and dinners, a good break from parks or going between Epcot and MK
Flame Tree at AK is likely my favorite though QS Yak and Yeti is also a place I enjoy, lots of food for just one person. FT should reopen after a delay in late May.
Sunshine in Future World has so many healthy choices with well prepared food, we hit that one up multiple times during a trip. Desserts are wonderful for a pit stop in Future World and their potato salad is soooo good too.
The Contempo at the Contemporary is similar to Capt. Hooks, with full meals for dinner and great sandwiches for lunch. Also a great break from the parks.
I'm a big fan of Earl of Sandwich in DTD. Seating is my only deterrent.
Yorkshire at UK pavilion Epcot always spot on.
Though harder to get to Roaring Forks at Wilderness Lodge, yum.
Breakfast at the Hallow, MK waffles fresh, hot made to order, a bargain.
The Boardwalk Bakery is good for sandwiches as is Starring Rolls at the Studios, both very share-able.
My experience is you can eat some pretty incredible food at WDW if you avoid the typical burger, chicken places and seek out the ones that offer fresh choices.