Lots of people use it a lot, here are 4 interesting streams, note the number of comments for posts: https://plus.google.com/+nicolesy/posts https://plus.google.com/+GuyKawasaki/posts https://plus.google.com/117176908342196183611/posts https://plus.google.com/u/0/+MikeElgan/posts

Lots of g+ is hidden of course because people don't post everything publicly. I like g+ much better than facebook and wish my non geeky friends and family would come over to it.