I'm the same - I have been using Dvorak for twelve years, but that's all about muscle memory with both hands, I struggle to type with it without two hands in place. When I jump onto a colleague's computer I can use QWERTY OK because my brain reverts to the old four-finger typing I used to do. I'm much faster at Swyping on a QWERTY keyboard, though, because it's a different paradigm entirely - it's more about movement than keypress.