Dvorak plays pretty nice with default vi keybindings, for the most part. Both y (yank) and p (put) are on the left hand, as well as x (delete characters), . (repeat last), u (undo), q (record macro), @ (execute macro) and " (choose register). And even though d is technically on the right hand, it's still in easy stretch range of the left. You can do a lot quite quickly with those keys and a mouse. So I don't miss ctrl-c/v too much when I have vi keys available. Whereas the right hand tends to be a lot of movement keys, which are more important when not using a mouse: h (move left) l (move right), b (previous word), f (jump to character), t (jump before character), n (next search result), g (goto top/bottom/line number/etc).

The worst thing I've experienced with Dvorak is typing "ls<enter>" repeatedly. It's really painful on the pinky. Putting L on the right pinky stretch was a really bad decision.

One advantage Dvorak has over Colemak is that it's included with every OS and easy to switch to, whereas Colemak often requires a download and an install to use. And some games include Dvorak keybindings, but I haven't seen one with Colemak keybindings yet.

I learned Dvorak back in college, and got fast by playing muds. Type fast, or you're dead. Took a few months to get up to speed.