>I occasionally use it in the command line, by expanding *.

You can use zsh's fzf-tab as a supercharged tab-completion. e.g. you can just do

  some-command <TAB>

and it will put a fzf interface where the tab-completions would usually be, and you can pick whatever files you want. And if you instead do

  some-command -<TAB>

it will instead show you all the possible flags and their descriptions, which you can also pick from.

I use this all the time on the terminal now. It cuts out so much pointless flow-breaking invocations of ls and man and --help.