Google+ is awesome, it gives you the ability to expose your content in a different yet similar way of that of Facebook. The best way to get traffic from G+ is start your business page and join a few communities related to your niche and start posting to those communities. Post 1-2 times a day and I guarantee you'll start getting traffic from G+. Also post to the general public from your biz page with the right hashtags, use 2-3 hashtags per post so that it won't be considered spammy.
G+ is still good for business professionals to share their ideas and to promote their products. It's important to gain the followers, it can be done by being active in posting interesting topics, taking part in the trending discussions, etc,
I get a good amount of traffic and exposure from using Google+ for many of my sites. I market the content/posts/etc. on Google plus as well as other relevant information (from other sites that are not mine) that might be helpful to my followers or random viewers.
I think that if you are not just promoting your own stuff but other helpful or informative posts from other sites that can help build a little credibility so people don't think that you are only there to push your stuff but to offer help from other sources as well.
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8 Ways to Drive Traffic to Your Site With Google+
Use “Their” Keywords, Not Just Yours
Size Matters
Train the Google Machine
Author Authority
Web Links Both Ways
Engage and be Engaging
Use +1 Buttons
Use Pictures and Videos