I looked this up and Standstills or Track Stops may have their origin in Track Velodrome Cycling, http://en.wikipedia.org/wiki/Trackstand , this is where you don't take your feet off the pedals and come to a complete standstill on the bike, see pictures.
So I think Paul was mostly correct in the post but at the same time, with those Standstills, you don't need to pull the cleats out of the pedals. Of course, I can't claim to know what a person is thinking. I'm sure most people who use them are very comfortable with the clipless pedals.
Also, I'd remember, clipless pedals or not, each cyclist needs to use plenty of caution. A person using regular pedals can likewise be careless. It is easy to be careless on the bike, I have been though not in a number of years... more or less.