I would say win+d is for cool people, but then I'd be associated with emmille, and thus have to go with "Who needs a desktop?"
I think i only actually see my desktop the first time i login, which isn't all that often anymore, basically whenever i need to change some hardware or so. (Linux desktop ftw) I might occasionally see the desktop image on the 2nd monitor if i've stopped working on whatever was there, but thats about it.
Also, Yakuake ftw \o
(Oh, and keyboard shortcuts for all important apps is useful aswell, G15++)