I like tmux because it does more than tabs in an emulator. I can detach from a session on a remote host to leave a process running after I disconnect, or to pick the session back up on another PC.

I do use tabs rather than repeatedly switching tmux sessions, but I do end up running tmux for splitting the GUI into side by side layouts.

Detaching is working just fine with `screen` as well.

I like the idea of tmux but as another poster suggested, I prefer to just get better at my window manager to achieve similar results. tmux requires way too many key presses for me.