When we were at MK in April we loved Mickey's Philharmagic. The second time we went in was very uncomfortable for me though due to the large woman sitting next to me.
She was already seated, and overflowing into MY seat. The theater was packed, and I had no choice but to sit ON the parts of this woman that were in my seat. I was so embarassed, but heck, it was MY seat.
I also remember on Splash Mt DH and I were packed in pretty tightly. His legs are long and we had a backpack.
The problem with a log of attractions at WDW is you can't actually see them until you have waited in line. You have no idea how large or small the ride/seat will be.
Good luck!
Karen