With its sheer size and tight integration with Google's other products like Google Search Engine, Blogger and Youtube, if search result (especially from Google Search) is important to you (or your business), you will want to get your hand "dirty" in the Google+ space.
Study shown that Websites with the presence of Google+ Business Page can potentially raise the Search Rank by 15%. Check out the infographic below for more details:
So, what are you waiting for? It is about time to get your business (or online presence) Plus-ed, if it has not been done so.