My answer is a resounding "yes". I joined Google+ before it opened to the public, thanks to a friend who sent me an invitation. I liked it from the start, and I like it even more, now.
The thing I like best, and have found most useful (since this is a post about utility, not just enjoyability) are Communities.
If you aren't on G+ yet, or if you've just registered, you may not know what Communities are. They're like Groups on Facebook or like clubs in real life. Someone sets up a Community based on, say, Schnauzers or Crafts for Kids. They can invite people to join the Community. People who join can invite other people to join. People can search within G+ for Schnauzers or Crafts or Kids and find the Community that way.
There are too many Communities for Writers to join them all! My two favorites are Readers Meet Authors and Bloggers, and Literary Agents Hate Kittens. I've met some wonderful authors, bloggers, and just folks in both of those Communities. I've made promotional connections, made connections through those connections, drawn readers to my blog and my books and picked up valuable information through those two Communities alone. This, in addition to the personal satisfaction of "meeting" a lot of people I like and enjoy "hanging around" with.
Interaction is encouraged. Hopping in to drop a link and never doing anything else is frowned upon. That means getting the most out of Google+ may be a little more time-consuming than Twitter, but it's time well spent, professionally and personally. When I publicized a KDP free offering of The Fall of Onagros, Book 1 of my SAGE fantasy, people I didn't even know grabbed it because they saw it in their G+ timestream, and they took the time to comment on the offering: "Thanks!" "Looks intriguing." "Sweet!"
I like that. Maybe you will, too. If you add me to your circles, let me know you followed me over from this post so I'll know to add you back. See you on Google+!
Fantasies, mysteries, comedies, recipes