I've gotten along personally really well with three of my therapists, and we still keep in touch a bit even decades later. No, not countertransference; just plain old friendliness after years of working together. They were all very open about themselves personally while they were my therapists; definitely not blank slate kind of therapists. But they were very professional with healthy boundaries. Our personalities meshed and probably had we met under different circumstances, we would have gotten along. (Actually with one we did know each other prior to therapy and did get along very comfortably.)

Not everything is transference/countertransference. Sometimes it is just a matter of personalities that jive.

Sounds like you have a great working relationship with your therapist.