Earlier quoted context omitted.
I wouldn't say I love tmux, but I have a configuration file that I put on every computer I use regularly that is very comfortable for me. I basically live in the terminal across many different machines, and having the same interface for managing panes and tabs even when using ssh is invaluable. I also use vim (well neovim) as my primary editor, and have set up tmux to integrate well with it, so that might contribute…
If you spend any amount of time on remote machines with unreliable connections, local tmux is insta-reject because tmux inside tmux is very inconvenient. As with GP, it's also why I don't consider terminal emulators without tabs at all.
Hitting c-b c-b isn't that inconvenient?