Big fan of all of the items mentioned here. I love the "intuitive split commands" -- I'll add that.

For the vim/nvim fans out there, I try my best to add "vim-style" key bindings for navigating between panes, so that e.g. ctrl-h, ctrl-j, ctrl-k, and ctrl-l can be used to move around qukcly. My dotfiles are here:

https://github.com/jay-khatri/dotfiles/blob/main/.tmux.conf