Goofy4Donald,
We aren't big breakfast eaters so we just eat a light breakfast from the resort food court. We eat a early lunch, around 11:00 a.m., at the Toy Story Pizza Planet. We purchase a light snack mid-afternoon. Our dinner reservations are usually for 7:30 p.m. or so. We go to WDW in June so, many times, there are two Fantasmic shows. The last one is definitely the least crowded. It takes about an hour to eat at the Sci-Fi. We usually try to head to the Fantasmic theater about an hour before the performance. They will allow the park guests into the theater about an hour before the show. We go ahead and pick a seat and just hang out until the show. We spend this time to reflect on the day.
I would definitely say that lunch at Toy Story Pizza Planet, dinner at the Sci-Fi and then Fantasmic is DOABLE!
Have a great time, Lisa