Touch Typing

It really helps in speeding up things. I never look the keyboard except when there is unusual key to be pressed. Touch typing can help you become a keyboard person. For a developer, it opens doors to tools such as Vim, Tmux which are primarily keyboard driven.

It isn't too hard to learn either. If I can remember it took me about 1 month to gain a sufficient speed for my requirements.

Yes. It's less about the speed and more about being able to type without concentrating on searching for the next key. The human mind can only keep track of four things at a time, and you need them all for programming. You want to avoid wasting attention on typing.

Yes!I have spent years and years not knowing how to type and have recently committed to spending 15 minutes a day learning. It has been a tremendous help in writing code and efficiency. Just being able to see the words that I am typing as they come out allows me to use Intellisense better, remain in a flow state longer and has relieved a constant source of dissatisfaction and frustration.
I am working on a series of blog posts about the experience of learning and what tools have helped me the most.

thedevelopingdeveloper.net/2020/02...

There was a nice discussion about this very topic at the beginning of the month:

dev.to/dmerand/is-touch-typing-an-...