I love that if you have vi key bindings active you can update the prompt when you change modes. I never used vi bindings in bash because I would become confused when I entered normal mode without realizing it. In zsh it was easy to configure my prompt to change colors and symbols when outside insert mode.

https://github.com/everett1992/dotfiles/blob/master/home/.zs...

I have noticed that zsh's globbing is greedy.

    `grep ^foo *` tries to expand ^foo when bash would pass it as a string to grep.