I am actually friends with my former therapist. I had to change insurance because the one I was using was no longer offered on the marketplace. Couldn't see her anymore. She let me continue seeing her for like 1/4 her normal rate for a few months until I could get into a different doctor. Now we text, chat, and see each other at pride (she is a 65+ straight, cis, married woman in southern US). If I'm going to be in the city where she's at, we'll occasionally get lunch or something. She's awesome.
Oddly enough, though, I think that level of friendliness messed with the actual therapy. Love her to death, but we did more chit chatting than actually delving into anything, and I got so fond of her that I began to get embarrassed sharing anything that I wouldn't already share with friends/family.
If you feel this, that’s good because it means you really vibe with your therapist and are more comfortable being honest and vulnerable with them. If you feel no connection at all to your therapist that’s probably not ideal!