I feel like Google is pressuring us to use it, because it does help to boost your rankings on Google somewhat.
But no one is really using it. The only use would be to improve your SEO but that's about all you can get out of it. Its better to focus on other social networks where people actually use it for more than 5 minutes.
Google + seems more personal social network than a professional platform to promote business.
Having said that, it does not rule out the possibility to get votes via +one buttons and get an additional SEO boost.
Yes, Google plus increase visibility of website because when more and more people plus 1 your website than it improve search engine visibility but condition is that “search plus your world” should active with profile. It also increases traffic. But we cannot ignore other networking site also.
I don't mind it being mainly the SEO and online people since that's my target market. I've been using G+ in my social media mix the past few weeks or so. I don't spend much time so can't complain with the handful of sales I've picked up with leads from there.