I have Google+ and don't particularly see any benefits, but I got it because it was said that establishing a Google author profile (which doesn't have to involve Google+, of course) could be helpful for writers. I already had several Google products anyway, so Google+ was kind of a "no-skin-off-my-nose" type of thing at that point.
I also had already had a bunch of Yahoo stuff (and resisted, as much as possible, Yahoo's invitations to lump yet more and more stuff together through them). So, between what I already had with them and Google, Google+ was kind of matter of not bothering to shut the barn door after the horses had been out for quite some time. I don't know... I don't like it, but at this point I have a kind of "it is what it is" thinking. I do keep as much separate and private as possible (and don't delude myself into thinking those steps do a lot of good).
Then again, as a writer (and particularly with some of the kinds of stuff I write about/plan to write about), I do think I have to establish a certain amount of "who I am" to anyone who reads some stuff.
Other than writing, I'm not really "an Internet person", so I don't go looking for interesting stuff online, and I don't really know how to socialize with anyone that I don't already know, or else don't meet in person. (Maybe I'm showing my age with that remark.).
I thought I'd try setting up a Google+ circle for "HubPages acquaintances", thinking there'd be discussion of online and HP writing. Instead, Google+ kind of turned into little more than a recreation of HubPages, which I can find - where else - at HubPages.com when I want to. :)
So I guess my answer is that it may be useful to me either in ways I don't realize, or maybe in some way in the future; but as of today I don't happen to find much obvious use for Google+. Well, it's supposed to be for socializing, so the person who isn't Internet-socializing inclined, or the person who doesn't want to see links to Hubs (even with the obligatory remark in an attempt to make them seem less spammy), isn't going to see a lot of obvious use for it. :/ Not that anyone asked, but I really, really, hate the new look of Google+. I'm not sure I'm going to be able to stand that look for too long. LOL