You're right about that, but Dvorak is much easier on the hands. The average distance travelled by your fingers is greatly reduced. (It looks like Colemak beats both, though: http://colemak.com/Compare.)
I type Colemak 99% of the time, but the 1% I don't, it can be a really frustrating experience. It amazes me that 20 years of typing ability was forgotten almost entirely in a month.