Hm, I seem to be another exception and a new kind of exception.

I had a typing class (3rd grade) and used software for learning typing (Mavis Beacon on a Mac). Neither helped me to touch type, but I still learned to use all fingers when typing, and today I can do ~90 WPM -- although that's brain-to-typed letters; I go slower for transcribing a given text. I also use an ergonomic split keyboard that's much harder to use one-handed.

And the way that I learned was through gradual adjustment after needing to type a lot. Basically, I started out as a hunt/pecker (after trying Mavis and the classroom) and then made it a habit to, every once in a while, type a letter with a nearby finger instead of the forefinger. Over time, my hands moved less and less until they just settled on the method that is touch-typing, depending on what you count as T-T, since I have some quirks.

For example, I usually do capital letters with one hand (pinky on shift, one of the remaining other fingers for the letter) rather than using the opposite hand to shift.

And I actually prefer using the keyboard when possible: for a while I was on a quest to see how long I could go without using the mouse, even so far as to add and edit a firefox extension that let me browse the web with one hand on the keyboard. (I took one of the existing ones and changed it so it only used keys on the left side of the keyboard.)