There are really tons of people on Google Plus; it's just not friends posting what they're doing today.
I do have one friend who really needs to find twitter. When she's watching "her" football team (or any team, really), my feed has running comments on the game as her status update. *rolls eyes*
Google Plus seems to have a lot of thoughtful people posting about current events or technology or .... well, you just have to find them. I clicked on "what's hot" once and it was amazing.
"Fun must be always." - Tomas Hertl, San Jose Sharks
"It was fun." - Kirk, Star Trek: Generations