I can't fathom why anyone would NOT use right click.
I can. I make DX themes. Ok, we all know that. But I put all my shortcuts into my themes, then make them widgets (because even tho I have it set to do so, DX will not run at startup on vista) so they can start with windows. Properly setup, my DX themes/widgets contain everything I need to use. Everything. I need no start menu, no Object Dock, no Right Click.
That said, I do think RC is an awesome app, and if DX ever dies, God forbid, I might be an avid RC user. Now RC, for me, is good with just the normal stuff enabled in it, just to skin my context menu.