Hi, Hcalvert!
We've visited Disney World recently with kids and one of our favorites at Animal Kingdom is Yak and Yeti. My daughter (16) says it's her favorite restaurant period - anywhere. She likes any of the noodle meals and loves the chicken and waffles. It's got a fun atmosphere, too. Your son may also like the ambiance of the smoking volcano at Mexico's Epcot Pavilion. We recently dined at the San Angel Inn (after years of skipping it from our 2010 trip) and were pleasantly surprised. The steak was really tasty - and perfectly cooked! Plus, the Three Caballeros boat ride is a fun little excursion. Our teenage son can never resist putting on sombreros and taking goofy pictures. At Magic Kingdom, if y'all like Italian, Tony's Town Square is quite good. We ate there three times in 2018 and were very pleased with both food and service all three visits. Our son likes the spaghetti and meatballs and the made-to-order pizza. Our other family favorite at MK is Liberty Tree. It's "family style" and our two picky eaters have always eaten well here. It's just a ton of food, but so yummy. Looks like you've already tried our favorite at Hollywood - 50s Prime Time Cafe - we've eaten there EVERY VISIT without fail.
We have tried The Plaza in MK, but were underwhelmed. It's pretty standard and bland sandwich/salad fare. The service and location were both positives, but we haven't felt the need to return. It's just kind of "there." Food taste and selection didn't win us over.
Good luck and have fun planning!!
Honestly it may not be the best for your son but I'd highly recommend Jiko. Easily my favorite restaurant there. I also have to give a +1 for the Yak and Yeti recommendation. Casey's Corner is an awesome QS restaurant at MK that you should definitely check out.
Yak & Yeti...one of our favorite go to's when we visit.
Sanaa at AKL, if for nothing else, the bread service.
Garden Grill, i see you mentioned. The wife and i visited and really thought for just the 2 of us, there was too much food! It was good, just too much. We both felt obligated to eat more...all the way into a food coma.
What dishes would you recommend at Yak & Yeti for dinner? Thanks.