My sister in-law just brought her 8 month old son on our little trip. We were there July 13-16 and stayed at POP century. It was definetly hot, but really everything went great.
I would suggest requesting a room on the bottom floor and close to the lobby/or bus stop. (if you haven't already). You can also ask for a crib and a refrigerator if your room doesn't already have one.
My SIL brought her own stroller and we never had any problems with it. We even left things hanging on it and nothing was taken.
One note: CMs often move stroller to a different location while you are on a ride.
If you do want to ride rides he can't, I would suggest baby-swap. It was so easy, just tell the CM at the entrance you would like to do that.
The rides/attractions he rode/saw (or at least that I can remember) were IASW, Mickey's Philharmagic, PotC, Great Movie, Fantasmic, Wishes, Spectro, Backlot Tour, Little Mermaid. I am sure there are other to do, that's just what we did.
The first day he went all day, from 7am to 11pm. He just napped in the stroller and we made sure to see air-conditioned attractions. SIL was still breastfeeding primarily, but she had juice bottles. The first night he had a bad night, so the second day she stayed in with him til about 11am, then we took a break in the afternoon.
We did some character meals and after getting over the whole "what the heck is that big dog looking thing" reaction, he did interact with the characters.
He was great on the plane (2-hour flight), we just gave him stuff to play with the whole time. Because she is breast feeding she didn't need to bring much on the plane, but I do know they make an exception on the liquid rule for baby stuff.
That's reallly all I can remember. It was a really great trip and he had very little problems. I think he had a bad night because it was hot and we went all day without a break. So a break is what I would recommend. If not taking one back at the hotel, then really find a place to sit and do nothing for a while.
Good luck!!!