I've even registered in this project because I thought it would be literally "Pinterest for code".

I'm sorta GitHub star hoarder, have starred 1.9K repos at the moment. I use that to track libraries I'm interested in (and their counterparts in other languages, for inspiration), projects addressing the same niche as the ones I'm working on... GitHub star-search is good, but can be made even better. And also some projects I don't want to forget about are not on GitHub — and I'd prefer to have a single place to store all those in a searchable fashion.

Such project I would use on a daily basis (or I'll have to write one at some point in future).