In US academia, virtually NO ONE uses "Dr." as an honorific, except perhaps undergrads towards a prof of one of their classes. I defended *mumblemumble* years ago and it's STILL strange to be called Dr. lastname (despite what my username might imply! That's a MST3K ref.) (As an aside, it *is* pretty typical to ritually address someone as Dr. such-and-so right after they defend. Sort of a "welcome to the club.")
I now work at a Federal agency, and I've found it fascinating that, typically, those higher up the ladder get called Dr. Whatever when being talked about, while everyone else uses first names as a matter of course. However, when talking directly *to* the higher-up, people use first names. So you could say to someone, "Well, Dr. So-and-So says that...." and then turn around and say, "Oh, hi, Joanne! I was just saying that you indicated...." It's an odd dichotomy.