Thank you Busy-retired. My eyes were opened when my husband became a wheelchair user. Fortunately he can walk very short distances which helped in Paris when I had to carry his manual wheelchair down the steps to the boat on the River Seine. No one helped. Paris was the worst city that we have travelled to. This isn't because of the cobbled streets etc, which were difficult, but you expect that in an old city. It was the rudeness of the people. I was sworn at and reduced to tears on more than one occasion as I was not moving quickly enough. I didn't get help at all with carrying the empty wheelchair down numerous flights of stairs/steps and getting hubby up kerbs where drivers had blocked the few dropped ones there were, was a nightmare.
Paris is a beautiful city but we won't go there as a couple again.
As for Vegas, we were told that the Deuce bus prioritises disabled people who automatically go to the front of the queue. We didn't get to try this out but apparently everything stops until that person is safely boarded. Maybe the OP could try this and report back? We have travelled fairly extensively in the States and find it pretty user friendly from a wheelchair users point of view. It is just some of the older things such as the San Francisco Cable cars that can't cater well for people in wheelchairs.
Thank you for your kind comments, though people with disabilities don't have a choice in struggling with these things if they want to do anything or go anywhere. It does get very wearing as I am sure you well know.