Are there any *doctors* whose nametags display first names? Or is it all "G. House, M.D." and "M. Grey, M.D."? I'm guessing the latter.
I was a nurse's aide in the '70s and about the same time I knew some nursing students. My nametag read "B. Lastname, N.A." My nursing student friends were addressed by their teachers as "Miss _____." (I didn't happen to know any male, or married female nursing students). On the floor, the nurses wore nametags like mine: "M. Smith, R.N.," "J. Doe, L.P.N." We -- nurses and aides alike -- were free to introduce ourselves to patients as Mary or "Ms. Jones, your nurse" or Nurse Doe or however we saw fit. Among co-workers, first names were used, with exceptions for people in authority (as a nurse's aide, I'd call the head nurse on my floor "Ann," but the director of nursing "Mrs. Jones.")
Maybe it's my age/curmudgeonly streak showing, but I miss the days when doctors, nurses, ancillary personnel and patients all addressed one another by courtesy titles and last names. When it comes to patients, I know that HIPAA has a lot to do with the trend toward first-naming. But part of me thinks there was a lot more respect and dignity across the board when Courtesy Title/Last Name was more ubiquitous in medicine, and medical professionals had more of a choice. But that's a reflection on the informalization of society in general, not just the medical profession.