There's no across-the-board rule, but I think most doctors offices have you do it. When I went to my eye doctor, it was required and they really meant it; everyone in the waiting room was masked.

I felt like that for awhile, but I tried it again recently, and I think they've recovered.

I'm probably the only one, but what I miss is the carpets. Yeah, they were ugly and stained. But if you were standing up, they gave your feet a lot more traction.