My T seeks ongoing supervision so I'm sure it makes a difference to his practice that I don't even realise. He's a big advocate of career-long supervision so I'm sure he uses it in a thoughtful way.
There have been a couple of occasions when he has mentioned talking about me in supervision. One was during a rupture, and during a session he said he had supervision right after so would see what emerged. I emailed him later and I said I hoped supervision had been useful. He replied that there had been one or two useful insights that he'd be happy to share with me if I wanted to hear them. I never asked to hear them. I didn't think it was the best use of time in resolving the rupture. It's more about him than me. I'm glad he seeks it for himself and that he makes such good use of it.