I'd gotten very attached, yet I wasn't fully aware of it until I was warned some months back that we'd have to say goodbye (his retirement from private practice). The grief that hit me was something I've never experienced, and at that point it was just of only hearing the news.
Really I think the attachment was the one thing that helped me the most, even more than what we specifically would discuss, because I found myself trying more and pushing myself further so that I could meet what I thought were his expectations for me. I did not want to let down the one person who has actually been on my side trying to help when no one else could. His expectations were what I would hang onto, even while my own weren't enough to save me/keep me motivated to try. I don't have much hope my next therapist will be as the previous one was for me, but I hope whatever attachment there may be is helpful in someway as I try to move forward.