Gnome and KDE are no more difficult to configure than Windows or Mac.
True, but not relevant, at least in a server environment. Most of your servers probably won't have a GUI, or even a monitor, being administered by ssh and a CLI. For those few boxes that need a GUI, you're much better off with Xfce, Enlightenment or some other lightweight DE that doesn't suck up such a large percentage of your RAM and CPU cycles, leaving you with more resources to devote to work. And, even if they do take a little more time to configure, so what? It's a one time task, and trivial to copy from one box to another as needed.