My T and I had a conversation one time about whether it would bug him if I had liked the marriage counselor better as a therapist than him. [I was embarrassed about being worried about him liking my best friend who was also going to see him as a therapist better than me. So, as part of that conversation, I was trying to establish in my own head that my concern was normal because T wouldn't like it if I like someone else better than him as a therapist, if that makes any sense.]
Okay, long preamble to say that when I asked him if it would bug him if I chose the marriage counselor as a therapist over him, or liked the other therapist better, my T said, "Oh God, yes. I'd really miss you."
I know it wouldn't devastate him and he'd go on with his life, though.