I learned Dvorak in my teens, and can touch-type fluently in it.

But I've found it doesn't provide a lot of speed improvement, and for programming (with all its punctuation) I still use QWERTY. Since programming isn't primarily normal English language text, Dvorak really doesn't help, plus you have to touch-type.

What I use Dvorak for is for proper, sit-down, full-screen writing. I'm not sure it's much faster, but it's far more comfortable to type. QWERTY always "gets in the way" physically a bit when I write, but Dvorak lets my hands basically disappear as a barrier between brain and page. It just makes writing feel effortless.

Also -- Dvorak is useful for English only. When I write in Portuguese, it's not nearly as useful.