I agree with most of what you are saying, but in my case I have found G+ very useful in learning about new things. I think photography is one of the topics that has really flurished on there. Sure I could follow all the photogs on Twitter, but it was much harder to find them and G+ offers much more in-depth insight. This can also be said for me social media circle. What I find great is the commenting, like I have said before, it is like the Facebook commenting system with the people you follow on twitter.