I use all the fingers on my left hand, sharing the keyboard in half with the right hand.
The Left hands covers everything from G to the left, the Right covers everything from Y/B to the right.
My Left pinky finger, however, is only ever used for pressing the left Control and Shift.
On my Right hand, all but my Right Pinky is used. I think I find it too weak, if that sounds right.
I will sometimes use it to press the Enter button, but otherwise, I use the finger next to it for pretty much everything right of the Apostrophe Key.
Bare in mind, I use a laptop and have no numpad.
My PageUp/Down, Home, End and Delete key are on the furthest right hand side of the keyboard, with the Right Key at the bottom on the right.
The only time I slow down for typing is numbers, oddly, and sometimes the F# keys. Also, the Windows Key, but not the Alt keys.
Thumbs press space.