I understand that Dvorak hasn’t been great for you, but I don’t think it’s fair to attribute all of its success and merits to touch typing. The distribution of keys is obviously more optimal than than of QWERTY, and even if your analysis holds true for some Dvorak typists, I doubt it does for a majority (or even a significant portion) of them.

Speaking from my own personal experience, I learned to touch type (properly) on QWERTY first, but after a while I switched to Colemak. After yet another while, I switched to Dvorak, and have been using it for several years now. For me, Dvorak has been slightly more comfortable than Colemak (which, in turn, was much more comfortable than QWERTY); though I have to admit I’ve never experienced significant pain or cramps just from typing. In any case, I find both layouts to be a great improvement over QWERTY, and certainly not only because of touch typing.