I don't use bookmarks. I rely on history. If I want to find something, I'll type relevant keywords and the page shows up. It works without using bookmarks. I usually memorize parts of urls or title without effort, if I didn't have that I guess I would need bookmarks.

I think bookmarks would be good for building lists. Like recipes. But I'm not organized well enough to do this.

Careful, Browsers don't keep infinite history.

I don't use them because I have to know which pages are important enough to bookmark when I come across them first, rather than when I need them later.

Usually I rely on finding something in my history. If I need to get around to it at some point, I'll keep the tab open and I'll get around to it when (if ever) I'm closing a bunch of tabs in a row, which takes relatively little effort. If I bookmark it, it'll just sit there and I'll never think of it again.