I never used CDE for real, but during my training at a large-ish IT company, I worked on one project where our dev/testing machine was a small Sun server running Solaris 8 (it's been a while). After a while, out of whimsy more than anything else, I installed an X server on my windows desktop and logged into the Sparc server via XDMCP, so I got to experience the full grey-and-pink glory for a short while.
Anyway, what I meant to say is that it makes my nostalgia bone tickle that people are maintaining this software today. I might even try it out sometime.
Anybody know if it works on Wayland? (Just kidding! Or am I?)