I have seen 4 PTs. All of them worked individually with me and I was never left alone. The first visit at the first one I got an electrical stim treatment, which an aide gave me. I didn't like the group atmosphere of the first 3 places, although I guess that is typical. It felt creepy to be lying on a table and having the PT do some of the massages, etc, exercises with me in an open setting.
The last one I went to was a MacKenzie trained person, one of about 10 in MA. It was all in a private room, just me and him. He shared his office with a chiropractor, so it was not a huge PT place. Come to think of it, the second to last one was also a MacKenzie person, too, but she worked at another branch of the second I went to. He had referred me to his colleague, as he thought she would know more, which she did.