I think so, it gives signal that you are active on Google+, considered higher value to your site.. you may also get benefit if you link to other products/programs of Google like Google plus, Google Directory, Google Group etc.
Yes, G+ are great souce for traffic and rankings.Google+ are receiving a shot in the arm with Google’s search results. Links shared by your friends seem to receive a massive bump in your personalized search rankings. Their impact on rankings for the general public seems to be a bit larger than links shared on Twitter, but it’s too soon to know for sure. It’s a very new tool that’s still being modified by Google on a daily basis. As more people adopt Google+, they’re sure to adjust its impact on search rankings. http://seo-hacker.com/google-affect-seo/ This article shows how From a 16th place rank, it’s now in 6th place. Try it out for yourself. Google Plus works powerfully and Google has really given their Plus button a big advantage when it comes to their own ranking factors. It’s phenomenal. It’s crazy. It’s Google – and they now have full control. You either join the Plus one club or you lack one precious ranking factor.
Google+ is a social website and as per recent updates its good to have strong social signals. If you regularly update your social accounts, it will always give your profit.
Yes, Google+ helps! The point is linking to social sites and Google+ is become very popular now, it is also a program of Google so there would be higher benefit compared to others.