Why I broke up with Google Docs (We're back together)

Google Docs and I had a great thing going. I have been a user since its beta release in 2006. Later I began to experiment with its use in the classroom. Then I attended the Google Teacher Academy and was convinced that I would go completely paperless with all future papers I would assign. It didn't go well. See why Google Docs and I briefly broke up and why we're back together.

[Update] Aaron Slutsky commented on Google+ 
I've had some teacher screencast their comments to the students. Think it could be done as efficiently as making comments?
Screencasting paper comments may be even faster. I'll have to think about that.