I installed fzf years ago, used it for one thing, and forgot about it. This week I actually sat down and wired it into the bits of my workflow it was always meant for, and now I can't really imagine going back.
The thing that did it was history search. Ctrl-R used to be a slow scroll through commands I half-remembered. Now I type three letters from somewhere in the middle of a command I ran last Tuesday and it surfaces, instantly, fuzzy-matched. I stopped needing to remember the start of things. That's the whole trick, really: it lets you remember some of a thing rather than all of it, and it turns out that's how my memory actually works.
The other win was file selection. Piping a file list into fzf and binding the result to whatever I'm about to do means I never type a long path again. vim **<tab> and I'm picking from a live-filtered tree. Changing directories the same way. None of it is clever. It's just that the friction of "where exactly is that file" went to nearly zero, and friction is the thing that quietly decides whether you do the right thing or the lazy thing forty times a day.
If you've got it installed and you're still scrolling through history, spend ten minutes reading the keybindings. It's the highest return on a small effort I've had from any tool in a while.