I love tmux! It's perfectly usable! You only need a 400-line custom-built configuration file[1]!
[1] https://doc.xn0.org/.tmux.conf
Disclaimer: I am being silly but serious. tmux is absolutely not user-friendly out of the box. It is, however, extremely nice after an absurd amount of tweaking, which is either an endorsement or a damning, depending on your perspective.
Mine is only a few lines copied from jcs’s one.
https://github.com/jcs/dotfiles/blob/master/.tmux.conf
I’ve only reverted the prefix binding back.
I include lines at the top of my own https://andrew-quinn.me/tmux-conf.txt to make it easy to download no matter what kind of box I find myself on.
The Windows PowerShell one is aspirational and manifesting. I should add some angel numbers to it to hyperstition more of what I want to see into the world.