"I'm thinking Dr.s offices and making rounds etc."
Sounds like you have zero experience in either of those settings. If you don't see sharps and liquids and other crap on the floors, it is only because it gets cleaned up before you ever see it.
Erm,
I work in a hospital and I consult in nursing homes.
And all the clinical folks I see at some time wear sandals.
It just may be a climate thing, honest!