I'm on PF right now (I was in one of the beta waves) and it's fairly quiet -- which I like, frankly -- but that means it's hard to find people to add / follow if you don't want to join one of the big comms explicitly for friending people. I really do like the autistic comm they've set up there, it's a good insular place to discuss things and ask questions and get to know other autistic folks.

Overall I would say yes? Even if you're not creating fanwork or original fiction there are still things like the Blanket Boxes ( community for that here if it lets non-users see ) which are pretty rad.