Does anyone? Doing web dev on Windows means exposing yourself to a world of pain, which is why most are on MacOs or Linux anyway.
All modern high level languages have very good cross-platform system libraries and build tools for those languages usually use that language to run. Occasionally you'll run into someone that's still using Makefiles and have to break out msys but other than that it's generally fine.
I'm not trying to be inflammatory at all. I just never had any luck with any Ruby/Rails type stuff when I was forced to use Windows. I ended up resorting to JRuby.