I tend to just use my index finger on each hand unless I'm typing letters right next to each other. For example, in "other", I type the "o" with the middle finger of my right hand, the "t" with the index finger of my left hand, the "h" with the index finger of my right hand, the "e" with the middle finger of my left hand, and the "r" with a small movement of my left hand index finger. I hit the shift key with my ring finger or pinkie and the space key sometimes with my index finger and sometimes with my thumb depending on where my hands are.

I've been playing guitar for longer than I've been seriously typing and guitar places a heavy emphasis on efficiency of the movement of your hands and fingers. There are multiple ways to form a chord and multiple places on the fretboard to play a note, so you find the one way that is easiest to switch to quickly from your previous note/chord. I wonder if that influence has changed the way I type as I tend to slide my hands left and right along the keyboard depending on where I will be hitting the keys next.