I'm also a happy Dvorak convert. Yes, it's tough at first. Switches back to Qwerty also take some getting used to.*

I believe there is a universal benefit of learning a non-QWERTY layout. Many people learn QWERTY first when they are young, and as a side-effect, they carry with themselves the baggage of bad typing habits. While making an intentional effort to touch type with QWERTY can help significantly, I believe it can't compare to the benefits of starting from fresh with something new.

*I think I was lucky to have a job where I needed to make those switches often, so I gained proficiency quickly.