I used to be one. I’ve also been a 1/10x programmer.

Knowing and mastering your tool chain, language, editor infrastructure etc intimately; can have tremendous productivity gains. Having zero personal life also helps tremendously.

Features and products just flow out of you.

Personally I found having a family has many benefits, but I also lost that edge. Health issues also take away a lot.

Kids getting old enough to not require constant attention is allowing me to regain some of that.