I was there last week and they were having everyone do the scan. However, if people had trouble fore more than about 10 seconds (after being told to "squeeze your fingers together"), the hit the button and waved them in. It did seem to slow the lines a bit, but even during a very busy time, the line was never more than 4-5 people deep. Seems like they're beginning to get into the swing of how to use them quickly (enough).