I haven't read all the posts so I am probably repeating some
As a disabled person I ask that you:
Not walk in front of me and stop suddenly, my ECV doesn't stop on a dime
Understand that I can't stay on my ECV when on the bus, it will tip over on a sharp turn if I am in it - learned that the hard way

And don't sit on my ECV on the bus! I don't want you tipping over either

My ECV or wheelchair is my property (even if it is a rental). If you don't want me walking off with or moving your purse, don't touch my ECV.

Talk to me, not the person standing next to me.
Don't assume I am lazy because I am using an ECV and overweight or you see me walking fine sometimes. My disability prevents me from walking the distances required at Disney even though I walk fairly well. Trust me, if I could walk, I would. Driving an ECV in a crowd looking at people's rear ends is not my idea of a good time. It is worth it to be at Disney, but still not ideal.
Don't tell me how lucky I am to have an ECV. I have chronic pain, I don't feel lucky about that. And, no, I don't get to go the the front of the line with my ECV.
I know you are curious, but sometimes I don't want to explain my disabilities. Do you want to spend you vacation answering questions multiple times a day from strangers about your medical issues?
On the more positive side:
Thank you to all the people who make eye contact with me and smile
Thank you for everyone who politely asks if I need help instead of assuming
I traveled the country as a member of a wheelchair sports organization as a teen. No place I have been compares to Disney for accessibility.
When I went to Disney 99% of the people I met were great. I choose to ignore or politely educate the 1%.
I found that I was having so much fun at Disney, that I was fairly oblivious to what other people were doing.

Focus on having fun and don't worry about anyone else. I am so excited about my next trip.