I took your recommendation and looked through Google+ for communities that interested me, and didn't see anything promising, but the idea does have some potential - I do follow Linus and a few authors, and would probably check Google+ more often if I could find more interesting content, but I haven't found a killer feed to make it part of my daily routine yet.
I suppose different people use these sites in different ways, though, and I might check back periodically, but for now Google+ is just a Skype replacement for me.
But there's this interesting layer, for me, of other people that are interesting to talk to:
People who are willing to identify themselves publicly with their real name, and who are interested in the same things I'm interested in.
https://plus.google.com/communities
By joining Communities of like-minded people, it's very similar to subscribing to a sub-reddit. Except I personally see way less spam and trolling.
And I can mix that in, with the streams of other interesting people who are on G+.
Facebook != Hacker News != Google+
They're different. The reasons why most people SAY they don't use Google+ is because it's not the same thing as Facebook. I think they're wrong to have even thought of it that way.