Get out of vim insert mode *fast*

As a vimer you know your fingers should stay as much as possible on the home row.

inoremap jj <ESC>

In your vim's config file, will enable you to get out of the insert mode, by pressing 2 times the 'j'

More than speed, ease of use is to be considered :
Another trick is to remap the capslock key, but this way avoid stretching the pinkie.