Your contributions on StackOverflow demonstrate that you're passionate about your subject, articulate, and willing to help other. The gold badge reinforces that.

You're asking if it's worth something, I think it definitely is, but it's up to you to leverage it. Bring it up in your next job or salary negotiation, or when looking for freelance gigs.

Perhaps the most important thing for you though is to figure out what's next. If you enjoy educating and helping others, there are a lot more you can do: start a blog, write a book, teach a class, etc...