TBH, my first reaction to this comment was "somebody's wrong on the Internet". But luckily, reflection won over reaction, and gave me enough pause to realize what's really happening.

I have no idea where this notion of "shunning the mouse" came from. The simple fact is that when you're "in the zone", the mouse gets in the way. After having read and re-read other peoples code, and occasionally also having read half a dozen research papers, you are finally ready to dump all the code that has been brewing in your head. At that point, you are a typist. All the for-loops and switch-cases and function calls are jostling around in your head, and you want to serialize them into source code as fast as you can. When you're doing that, forget the mouse even the arrow keys are too far away. All you want is "do what I mean" with "the thing at point". Everything else just disappears outside your region of focus.

So yeah, the mouse is awesome when you're browsing and reading code. But when you're typing code, the home row is the fastest way to get it all out.

EDIT: s/two/too/ far away