I had a totally bizarre experience when I tried learning dvorak and gave up halfway. I found that it temporarily broke my ability to type at all and I became computer illiterate for a day. It was quite surreal. Some months later I learnt Colemak instead and found I was automatically keyboard-bilingual. My brain must have done some rewiring from my first experience. Now I can touch type naturally in Colemak, and still roughly type in qwerty (I learnt colemak because I originally sucked at typing and wanted to start fresh.)