I did a search on allears.net (deb wills site) and found the following regarding zero entry pools.
Animal Kingdom Lodge - Zero entry
Grand Floridian - zero entry
Polynesian - zero entry
Coronado Springs has a place for folks in chairs to slide off onto a step and slide down into the pool... with an extra railing, too
Port Orleans Riverside - Handrails and ramps have recently been created to aid wheelchair visitors.
Carol