tmux. I mean, I know it's better than screen, but I'm a user of emacs for 25 years, and I still can't get used to the tmux keymapping. I'm reluctant to customize them because I want my fingers to do the right thing on an unfamiliar system. And so many of the defaults are just bad, like constantly renaming windows when you run commands (without making a config file change). Even the command line arguments are different for the same parameter depending on which sub-command you're using.
I’m very grateful for iTerm - I tried to use tmux on a few occasions but it’s just so bad with the defaults. With some software it’s fine to have bad defaults but the occasions I need tmux is on random systems where I don’t want to have to ship dot files around.
