[CalRobert]

I like the ability to easily have multiple panes without having to learn tmux.

[howlinbash]

I find that Terminator solves this problem.

You can control it with the mouse and the keybindings are much closer in simplicity to iterm than tmux.

https://linux.die.net/man/1/terminator

Check it out :-)

[pareidolia]

Try Byobu (http://byobu.co/) it's a convenience package on top of tmux or screen, your choice.