I think you were posting last summer about your DGD when we were about to take our first Disney trip with my DS, autistic and now 8 years old. We waited to go to DW because we thought he would be so overwhelmed.
Regret now that we waited. He had a few moments, for sure, but most definitely it was the happiest I have ever seen him. No second thoughts about where we will be vacationing this summer.
We stayed at the Poly and he loved it. The ease of transportation made it easy for us. He loved riding the boat over to MK. He could watch fireworks with earplugs at the Poly. First time for fireworks, always too close and too loud before. The landscaping is so pretty. I know he enjoyed its beauty at night and the music. The hammocks were nice for a swing, too. His favorite was the volcano pool, though. He loves to swim and go down slides anyway. When we talked about our trip this year, the volcano pool is the only thing about where we are staying that he mentions. He would be devastated if we stayed anywhere else (of course, sameness is important).
That was our first stay with the kids, so I can't compare with how he may have liked other places. But, he loved the Poly.
Oh, and Ohana Character Breakfast was pretty calm too. In fact, very calm. Perfect for him.