@therussellhome, you hit on one of my reasons for learning - to keep people off of my workstations.
Right now I'm at ~25wpm on Dvorak. When I need to do fast or extensive typing I switch back to QWERTY but I'm slowly getting more comfortable with Dvorak. What I do notice is that the division of letters between the hands is "blockier" - In other words, there's less back and forth and more 4-6 letter strings that are taken entirely with one hand.