I mostly don't read subreddits day-to-day, but rather when I'm looking up information on a subject, try to find an applicable subreddit and search for what I need in that subreddit. So I've found it useful for things like: "which flashlight should I buy?"

As another example, I had to repair my Fisher & Paykel double-oven last year and was able to find help from an F&P technician on reddit.

So, I guess I mostly use it as a reference where the information density isn't important to me.