As long as the power wheelchair doesn't have a bigger 'footprint ' than a manual wheelchair, all of the lines will be accessible to you whether you have a manual or power wheelchair. The size for a wheelchair is 32 inches or less wide and 48 inches or less long.
The one exception is Pirates of the Caribbean. Because the load area is in one area and the unload area is down one floor in a different building, it is difficult for them to move wheelchairs from the boarding to the unload area. They prefer that guests use one of the attraction wheelchairs if at ll possible. That way, they only have to worry about making sure there is a supply of attraction wheelchairs at the exit, not getting a particular guest's personal wheelchair to the exit.
If using an attraction wheelchair will be n issue for you, let the CMs at the entrance know. They can usually accommodate people, but my ask you to come back later if they don't have staff to do it at the time.
One other thing to be aware of - the exit has a very steep moving ramp. Don't use that - there s a small hallway with a small elevator to the left of the ramp. That will take you up and let you off in the area near the restrooms.