Wow. That's interesting. I'm having a very different experience. Since becoming more active here on G+, my site traffic has gone way up. Granted, I've had a couple big articles that got some high-level attention during that same time frame, so it's been hard for me to sort out causation. I definitely plug some of my blog posts here on G+, but overall, it's a pretty small % of my total posts.
I still like, and think that it's important to have, a separate place that I control. It helps me to have more control over the presentation experience (links and graphics) as well as being better able to lay out longer, more complex ideas.
Given the nature of your writing and thinking, +Jeff Sayre
, I'm surprised that you're moving this way. I mean, I get it, based on what you explained above, but it seems like some of what you write about is so big that it needs more room to breath that what works well here.