I switched to dvorak for a few weeks a few summers ago. Initially typing every single word was insanely frustrating, and it didn't get much better for me.

I've been using QWERTY for 18 years and I continue to stick with it simply because it's familiar and I'm surrounded by machines all day every day that don't allow me to change the keyboard layout. Alternating between keyboard layouts several times every day is just not worth the frustration for me.