When I doubled checked the link in my other post, I noticed some mistakes in the "Must switch from
ecv to manual wheelchair" part, so I'm just listing them for all the parks.
According to my park maps, at MK the rides where you must do that are:
WDW Railroad
Pirates of Caribbean (and move to ride car)
Small World
Winnie the Pooh
Goofy's Barnstormer (and must transfer to ride car)
Alien Encounter
Space Mountain (transfer to ride car also)
At Epcot, the rides are:
Body Wars (and move to ride car)
the Mexico boat ride
Honey I shrunk the Audience
Living with the Land
the line for Spaceship Earth is not accessible at all, so wheelchair and ecv users wait in line and board at the exit
At the Studio:
Star Tours (and transfer)
Disney Animation
Great Movie Ride
Rock N Roller Coaster
At AK, Kilimanjari Safari is the only one.
We have never been to WDW with a power wheelchair (DD will be using one in March, if everything works out). From what I have read on the boards and in personal emails, a power wheelchair can go on many of the rides that a manual wheelchair can go on. The xceptions I know of are Pirates (where they don't have a way to board wheelchair users at the exit) and Goofy's Barnstormer (where they drive the wheelchair over the track). I'm sure someone will correct me if I'm wrong.
I also know that people whose manual wheelchair is a more unusual style (ie, Jazzy power chair) have gotten hassled because the CMs don't recognize that it is really a power wheelchair.