An ultimate productivity key-binding in tmux is one to switch to the last session. I use this to quickly get between sessions really quick. Often I am working and need to lookup a quick note, or copy something into my notes, then get back to where I was quickly.
bind -n M-b switch-client -l
I think of this hub and spoke model, and use
last-session to quickly drive it.
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Also check out this long form post for more about how I use tmux.