If I was going to go to all the trouble of learning a non-qwerty keyboard layout, I wouldn't choose dvorak, but would probably choose something else that's supposed to be even more efficient and ergonomic.

But for me it's really not worth switching from qwerty, as I don't want to have problems typing on someone else's qwerty keyboard when I need to -- which is a problem I've heard many non-qwerty typists report having, even if they were once fluent in qwerty. Some do report that they can make the cognitive switch from one to the other relatively easily, but some can't.

So for me it's not worth the risk of spending all that time to learn another layout just to find it hampers my qwerty-typing ability when I might need it.

If I was going to learn anything, it would be steno -- as at least it being on a radically different keyboard should mean that learning it shouldn't impact my qwerty-typing ability.