Missviolet, if you have "hopping" skills then you will have no problem on any ride. I'm a para in a wheelchair but with great mobility and I have no problem getting on and off rides without assistance and in the required time limit (example - Thunder Mtn has like 25 seconds to get on or off or they have to shut it down or something). You will not need the Haunted Mansion to stop the Doom Buggy or even use the easy access Doom Buggy (unless you want to of course). Small World is an easy "hop" down into the boat and the Jungle Cruise boat with the wheelchair ramp/platform is super lame (in my opinion of course) and you will not need it either. The Pooh ride is just plane super lame and again you will not need the wheelchair accessible vehicle either.
Disneyland has become really handicapped aware these last few years almost to the point of being annoying (again, this is in regards only to me as I am very mobile and don't require assistance). Whenever they see me and the wheelchair they stop everything, get the special vehicle/boat and or slow or stop the ride. I realize this is needed for some people but I wish they would ask if that's what I want first before doing it. I just want to experience the ride like everyone else (except I like going up the exit and not waiting in a 2 hour line).
Eh, what can I say, I want equality but I want the perks too.
Have lots of fun on your trip!