You definitely should, half the fun is creating trope pages for things that don't have pages yet. And yeah, I remembered how it opened my eyes when I first found TV Tropes, it was awesome to discover a site where everyone else was as addicted to chronicling and tabulating media as I was. I was never actually hit by the infamous "TV Tropes fatigue" because I binge-read the whole site in my first year, and after that I only check when I've absorbed a new form of media and want to learn more.
TV Tropes was also a huge part of why I survived college. They simply assigned too many books to all read in time, but I knew they'd have their eyes peeled for people cheating with SparkNotes and similar sites. So instead, I read the Wikpiedia page to learn the book's plot, and TV Tropes to learn the book's style. Together, they're a great summation of the work, and it prevents your essays from feeling as clinical as people who relied on SparkNotes.
