when we were small, we tended to call friends' mums "Auntie X". I do remember one of our "gang" who didn't use this, called my best friend's mum just "X" and we were all quite
. People we didn't know so well, were Mrs. Y. All school teachers were Mr, Miss or Mrs. Z (but not in my younger sibs' school, where they were more "progressive"
and used teachers' first names.)
When I started work in a hospital, staff were starting to call patients by their first names. My grandmother for one loathed this, as even her best friends had never used her first name, always called her Mrs.W.
I also found it extremely offputting when doctors would ring the labs for results, and just say "hi, it's Bethany here, can I have the results on patient A" - er, no you can't unless you demonstrate you have some right to be hearing them, i.e. you're a doctor or somesuch, in which case you should be saying "hi, it's Doctor Smith here..."
BUt now... in my play group, we all call each other by first names and all our children call us by our first names and it doesn't seem weird at all. Strange, huh.