> Personally I found zsh worth switching to even without spending any meaningful amount of time learning to use it.

Definitely. Smarter tab completion and smarter word deletion (Ctrl+W) are probably the two "most used" features for me.

FWIW, after ~6 years using Bash, moving to zsh last week was a revelation. I swapped to tmux (after dabbling in screen) the week prior. Has been a good fortnight.

[1] https://github.com/robbyrussell/oh-my-zsh/ is a great source of zsh plug-ins and configs. I use the "simple" theme and the git, brew and gem plugins (amongst others): https://github.com/elithrar/dotfiles/blob/master/zshrc