I've worked with another Forth disciple in the late 80s.

He was on a PC, and thought that my Mac GUI was neat. So he wrote a portable GUI framework from scratch in Forth that had dialogs, buttons, pull down menus, text inputs, graphics, mini Mac clone. It was magic. I think it was way under 100K.

After that, I really wanted to become a Forth wizard. I tried, but it never clicked, my code was very clumsy, write only. I admired my coworker as an almost alien intelligence.

I think it really works well for coders spiritually close to hardware.