Helen, We are in a similar situation as you. We have a DD7 with sensory issues. I have no idea if they will block a room for you or not. We stayed at All star Movies last month and called the hotel direct a couple days before and explained the situation with our daughter. At check-in we assigned the perfect room for her. I have no idea if we were just lucky or if they indeed do "block" rooms for families of special needs children. We were given an upper floor room without a connecting door and it was very quiet. The rooms at All star movies were quite vibrant (colour wise) but I have read that POP's rooms are much mrore subdued, so that might help also. Also, a view of the lake (vs. courtyard view) may be quieter.
Have a wonderful time.
Suzy V.