Though it's much weaker than saying "emacs influenced the massively adopted programming language I went on to write"...in many ways, having a computer that, as is - was unable to run Doom - led me to understand good old autoexec.bat and config.sys, what extended memory and himem.sys were, mouse drivers, etc, etc.
On the emacs front - emacs lead me to realize how useless the capslock key was, rebind it to Ctrl on all of my computers, and forever make numerous typing mistakes whenever I use someone else's keyboard :) Worth it.
Good little read.