I do agree that there are some theatre companies that have great ushers, and others not so much. Truth be told, it makes for a better theatre experience, at least in my opinion when the theatre staff is easy to deal with.
For example, I was at a performance of Hair where there was a group of friends moving round, some, like me won the lotto and were in the boxes others weren't. It was clearly driving the usher there up a wall and was bothering me. When I mentioned that to him, he said that I should go tell the house manager of what's going on. So, I did. The house manager told me to wait a moment in the lobby while he went upstairs to check on the situation himself. Once he saw what was going on he said that he was going to allow me to move. He had me follow him to my new seat. Turned out being front row center. Can't complain at all.
The only negative one I have isn't with house staff per se but more the box office. I was at the Lunt box office to buy a standing room ticket sometime between Beauty and the Beast announcing its closure and it actually closing. The woman behind the window took one look at me and refused to sell me one. Not because those were sold out (they weren't.) But, she refused to sell it to me because she was convinced that the wall was going to be too tall for me to see. Now, I am five foot seven, not super tall but not insanely short either. I had told her that even if it was, it's my money and if I wanted to spend it on that risk, why is she to stop me. Her co worker turned to her and told her to sell it to me. She eventually did, but she wasn't happy about it.