I find it helpful to be able to pop up a pane alongside emacs to do shell stuff. I realize you can do it in emacs but this way I can be certain my existing emacs buffers aren't going to be shuffled in any way. It's always nice to have options, even if there are multiple ways to do the same thing.
Has anybody benefited from using tmux with emacs? Or, when in emacs, is running tmux too overkill?