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The main benefit for me is getting to talk to people working (or playing) with the same software I have immersed myself in for years.
I'm always learning more Atlassian stuff from the Community, and get lots of help from them, but it's even at a point where some of us go on holiday together!
For an idea of the benefits, I'd simply have a look around, you'll quickly get a feel for what people are doing here and what they get from it. It would be good to have a quick read through the getting-started area at https://community.atlassian.com/t5/Welcome-Center/gh-p/WelcomeCenter
