Perhaps you don’t use it, but it is built into the OS and I bet a lot more people use it than you suspect. I find it quite useful all the time.

Did you know it works many places, not just the Finder, including places where there is no preview pane? (Eg with items on the Desktop.)

Did you know you can do useful things right in the Quickview, like mark up an image or PDF? Here’s more: https://www.maketecheasier.com/use-quick-look-macos/