Over the past one and a half years, Stack Overflow has lost around 50% of its traffic. This decline is similarly reflected in site usage, with approximately a 50% decrease in the number of questions and answers, as well as the number of votes these posts receive.
The charts below show the usage represented by a moving average of 49 days.
What happened?
It really doesn’t work as a replacement for google/docs/forums. It’s another tool in your belt, though, once you get a good feel for its limitations and use cases; I think of it more like upgraded rubber duck debugging. Bad for getting specific information and fixes, but great for getting new perspectives and/or directions to research further.