I don't think this is all that outside the norm, but I might be showing my age. Both my co-founder and I are exclusively vim users, and at a previous software dev shop I spent a few years doing contract work for there were several emacs (which I don't consider in the same vein as Eclipse and VS or whatever--though it depends on how you use it) users, a nedit user, and a couple of other users of plain old text editors. And all of them used the same set of custom build scripts and development tools, which were all command line with matched sets for Linux and Windows.

Only about 40% or so used a big IDE (Eclipse or Microsoft's stuff, plus a few IntelliJ) full time. A few more used Microsoft's stuff for the debugger when they needed it.