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The only CDE holdovers I've noticed is that last time I used it (around when 4.4 came out) it still defaulted to a centered panel taking up part of the screen on the bottom, and had panel "drawers" that didn't automatically close on you.
I still actually kinda miss the 4.0 behavior where the size of the taskbar button was completely relative to the number of tasks opened... With one open, it would take up the entire screen. That was changed in 4.2
There's also the "minimize app to desktop icon" that Gnome and KDE are sorely missing.
No desktop icons for me, but I just love the iconbox panel applet. Leaving all your pdf's, cbr's and all other stuff sitting there just a click away is really nice.