Richard - Followers and interaction build the same way on Google+ as on any other platform. A few suggestions:
Have you joined communities in G+? If so, do you participate actively? Do you +1 and interact with other people's content? Do you attend and comment in events that are relevant to what you do?
Do you have a "Follow me" badge on your website or blog? Do you include your G+ URL in your email sig?
Have you embedded any Google+ posts on Facebook, your blog or website?
There is an advantage in being an early adopter, and it can be a little lonely until the rest of the herd catches up. But the SEO and Authorship features, plus YouTube integration, live events, and truly terrific networking opportunities far outweigh any other issues in my experience.