I think fish is great for newcomers or for those who don't really want to mess around with too many settings or plugins.

I'm a fish user, actually. That said, for those on zsh who want some of fish's most prominent user features without leaving, check out zsh-syntax-highlighting[1] and zsh-autosuggestions[2]. These are rather popular so long time users may not benefit from these suggestions.

[1] https://github.com/zsh-users/zsh-syntax-highlighting [2] https://github.com/zsh-users/zsh-autosuggestions