We booked more and then I cancelled a few and added a few. In the end I had one more than I had dining credits for, so I picked the cheapest one and paid for that one out of pocket. As far a shade goes and a spot to sit, there are wonderful QS dining places that are also inside and you never feel rushed. In MK our favorite is the Columbia Harbor House, upstairs if available, great for people watching and AC cool goodness and Cosmic Ray's is also a favorite, love the chicken. At Epcot we love Sunshine Seasons inside the Land Pavilion, for the best selection of food and desserts. The QS location in France also has seats inside, stop there for sure and use a snack credit, great for a mid-day break from the outside. At AK, Pizzafari and Restaurantosaurus both have inside seating. At HS, ABC Commissary, (which now has steak on the menu), Toy Story Pizza Planet and Backlot Express have inside seating.
Almost all of the QS dining locations have wonderful outdoor seating. If you are going during a very busy time, if you eat off peak hours you will never have a problem finding a seat. If it is a moderately to non-busy time, then there will be many tables to choose from to take a break and rest the little ones feet. At the locations I stated above have plenty of seating and my family of 5 never have had an issue finding a seat.