I'm only on it so I can speak intelligently about it. After the travesty that was Buzz, I'm taking a wait and see attitude =]
I never had a Facebook account and was never really interested in social networking. But I've been an avid Gmailer since it was invite-only. I imagine that's why I'm here.
I'm with you Josh. I'm here out of curiosity but am skeptical about the longevity of G+ until they learn to play nice with FB and Twitter. And like you Tommy, I'm also a long-time Gmailer and use a ton of Google Apps every day. So at some level I'd be fine if this did take off.