In a lot of cases I find that its usually that people had written windows off several years ago and haven't looked at it seriously. For a lot of people taking the time to learn PowerShell or the "windows way" of going about something is either something they don't have the time or interest to do.
I'm sympathetic to that, don't get me wrong...if you have to get something done quickly you go with what you know. That's cool.
I've just noticed that a lot of the reasons that people give to justify their choices are predicated on an experience with an older version of windows or if you drill into it, they "thought" it should work one way and didn't take the time to find out how it actually works.
I personally prefer developing on linux because of the tools available, but they're both perfectly capable.