A motor is a lot better than a crank but still a little tedious. Make sure you can hit the button once, do something else for a minute, then come back to find the desk at the right height.

My favorite so far are the pneumatic/spring desks. Someone walks into your office, two seconds later you're standing side-by-side pointing at things. When you're done, it's just as easy to go back down.

There's still a lot of room for improvement though, no matter which desk you end up with.