Well, the problem with this theory is that a fairly significant portion of the line crowd had their ipads/iphones and were working away. I, personally, cleared out a significant portion of my Jira queue, and triaged (and responded) to pretty much the entire day's email while I was in Line in Palo Alto. It was actually a very productive 90 minutes for me.
Hmm, so as humans we should be productive every day, all day? Didn't realize if I took part of my day to wait for something I was excited about meant I was doing something wrong!