I went from "Terminal" to "screen" to "tmux" to "stumpwm". Baiscally, what I really liked of tmux is the way I could frame my terminals logically or fullscreen easily. I also really enjoyed the fact that I had multiple "workspace". Basically, my WM was just not appropriate for the way I liked to work. Stump fixed that. It's dynamic, I can hack it from emacs and it has everything I liked about tmux. Obviously, I'm talking from my desktop perspective, if I'm working somewhere else remotely it's a different story.