I'm on there, though mostly for the vibrant RPG community.
Whether it looks like a ghost town depends on how many people you are following, and which communities you're a member of. And whether you've configured those communities to actually show all of their content in your stream, which is something you have to do manually for every community you're in. So that's a pain.
Google has been trying to hard to chase people out of Google+, but people are still holding on, because there isn't really any good alternative. It's a shame to see Google undermining their own platform like this, though.