[gnur]

The gains from vim over using the mouse is mainly muscle memory for me.

I can comment out a function/block/line from anywhere in the function without looking at either the screen or the keyboard. And I do it without consious effort.

You probably use keyboard shortcuts to go to the end/start of the line anyway, if you expand that to all the vim movements that's what you gain. Adding composition and macros are just the icing on the cake.