Major milestones in my Linux journey. Writing this down for my own amusement, perhaps someone else will find it interesting as well.
Distro: RedHat 6.1 "Cartman" Desktop: GNOME 1 Shell: BASH
Distro: RedHat 7.0 "Guinness" Desktop: WindowMaker Shell: BASH
Distro: Debian 2.2 "Potato" Desktop: WindowMaker Shell: BASH

Screenshot of my WindowMaker desktop running Emacs and Aterm on top WindowMaker. The app in the upper right hand corner is a wee3D app I wrote in university using C, OpenAL and OpenGL.
Distro: Debian Desktop: fluxbox Shell: BASH
Distro: Arch Desktop: fluxbox Shell: BASH
Distro: Debian Desktop: fluxbox Shell: BASH
Distro: Debian Desktop: i3 Shell: BASH
Distro: Debian Desktop: i3 Shell: ZSH
After 20 years of using BASH, I switched to ZSH. The feature that won me over was the auto suggestion/completion overlay as it drastically speeds up the typing of long commands.
Distro: Arch Desktop: i3 Shell: ZSH