Window Maker looks alien to me as a Unix user. CDE is good, but I like TWM which is the default window manager in Slackware (if you want someting more Windows-like, you can switch to MWM).
I used WindowMaker from 1997 until about 2005, so it doesn't look too foreign to me. I kind of want to try it again to see how it holds up, but perhaps that kind of desktop is best left in my memories.
