I used it when I did my Master's thesis. Iirc, there are also browser plugins that you can use in concert that let's you move a paper you're looking at onto the web immediately into Zotero. Great tool, just now learning its an open source tool which makes it all the better for me.

I don't think I'll ever be done with the internet. But it's becoming clear to me that the kind of internet experience that I want (no ads, free and open source software, minimal mega-corpo investment in said software) will necessarily require more from me (more technical understanding, more configuring, &c).