As a power text-mode user, I was both surprised and glad to hear (10x @erikzaadi!) about two interesting tools: tmux & ConqueTerm, which significantly changed the way I use the shell/terminal. I'll try to keep it short and to the point, and briefly explain the most notable behavior-changing features the way I see them. Or in other words: why should you give them a try.
tmux is screen-like. I didn't get to learn much of screen (absolutely my bad), so it's really not a "why tmux is better than screen" post, but simply what goodies does tmux provide.