I had a new GP who was brand new to medicine actually back up from me when I told her, and a new eye doctor become wary when I told her (because of drug info). But they became completely used to and blase about it after a while. My dental assistant and I have had conversations about psychiatrists.

The more people casually mention they're bipolar, the more other people start thinking it's no big deal. I've had friends and relatives surprised that I'm still taking meds and seeing a therapist when it's happened to come up. I'm ready to talk about it but they never really care so we go on to something else. Your receptionist sees that you seem perfectly normal and hasn't thought of it beyond that.