So if you are typing a lot, I would recommend getting an ergo before you start having issues.
For reference I could type about a paragraph in one go on a regular keyboard, now I can type an entire page before I start having pains/cramps.
What has always stayed with me was her guidance on posture and form. The 'piano style'* on which she insisted is almost completely contrary to modern ergonomic teachings, and yet I can say almost 40-years later; still works and is effective.
I readily admit that I'm probably lucky too in that I don't follow that guidance to the T, I do however follow the basic form of it. This anecdote simply agrees with your statement.
*: 'piano style' wrists higher then knuckles, finger-tips hovering/barely touching home-row, back straight
What? That seems to be exactly the current advice.
http://ergonomictrends.com/proper-ergonomic-typing-posture-a...
http://ergo.human.cornell.edu/ahtutorials/typingposture.html
(First two hits from a Google search.)
I tested using by high end gaming mechanical keyboard at work and my error rate went down a lot