I can't stand Pinterest! Like you say Watson, I can never find what I'm looking for when I try to follow someone else's pins, and I hate how it's so high in search results in Google because it's pretty much always a dead-end. Now I check the link and if it's to a Pinterest site I don't even click it because I know it'll just annoy me.
Seems if you have your own Pinterest site it's somewhat useful for keeping links to things, but I find that bookmarks work just fine for me and I don't have to have (yet another) social media site that I'm logging in to.