Sample size of 1: I'm an EECS PhD student at MIT and one of my required courses (6.822) is taught entirely in Coq
OTOH, I've TAed an undergrad research class and it's mind boggling how many people are doing Coq-related research.
[1] https://frap.csail.mit.edu/main [2] http://adam.chlipala.net/frap/frap_book.pdf