I like /r/rust, /r/writing, and /r/sydney. I also like browsing by top of all posts for subreddits about things I don't know much about, like /r/sociology, or /r/meditation.

I don't think these are enough to make me want to stay on the site, because I can join the Rust Programming Language forum. I'm sure there is a similar analogue for the writing and Sydney subreddits.