One of mine falls in the area of video games: I've never played them much, and I deliberately cultivate a lack of curiosity about them because I don't believe the enjoyment or value they might give me would outweigh the amount of my precious time they would likely take up if I started. However, I spend more time than perhaps I should reading fanfiction.

This is tangential at best, but there's a way to combine these together: try IF (interactive fiction) games. At their best, they're a literary joy and a well-crafted, fascinating challenge. I recommend All Things Devours as a gateway experience.