Looking at the heat map, what does surprise me is how he never uses Escape or ^[. How does he managed to move out of Insert mode?

His 3rd most used command is jj. This is popular among some vim users to be remapped as Esc in insert mode (:inoremap jj <Esc>).

I do not personally use this but when writing this comment, I quickly tested it out and it actually feels quite comfortable.

I re-map my caps lock as Escape. It works suprisingly well even outside of Vim.