I have had those day when I crash from doing house work and been looking for the aspirin. IF you are in pain doing things like house work then do you really think the miles of walking are going to be less painful. Your house is nice and flat but imagine bridges, ramps and curbs you will be crossing. There is the standing in line for half an hour, the dodging people on the sidewalks, and the climbing into and out of ride vehicles.
Time on earth is short even if one lives to be 100 years old. I rather spend my last 50 years as pain free, mobile and stress free as possible. I so needed an
ECV in San Antonio and one would have let me explore the Alamo and gone shopping but I did not get one and regret it.
Some people are ECV bound and depend on one but many are like myself and use one to get from point A to point B. Use it to get to an area then go see a show or do a bit of shopping. Read the boards and you will hear of people regretting not getting an ECV. The distances cna be far and it is a burden on the family if you end up cranky from pain or have to sit down every few minutes.
Busses: This is the top complaint on this board probably. Some people have no problems and others are trouble magnets. Currently people are educating, documenting and formally complaining. People are teaching others about disabled rights, what is not disabled rights, documenting transportation problems, and then reporting to supervisors, WDW and the boards.
Odds are that you will not have a problem especially if you are educated, prepared and willing to fight for your rights. Drivers would prefer to just open a door and have a herd of people on quickly then drive off but they need to realize that their job includes servicing the disabled.
I think you would not have troubles with transportation.
Get the ECV, trust me you will have a better time.