Greetings,
Interesting but don't be deceived by the seeming chaos. These are professional boat handlers. Most probably some have been doing this since they learned to walk.
Some years back the Admiral and I took a 5 day Yangtze River cruise on a 300' boat. The places the captain/crew could park that vessel simply boggled the mind. Almost every time we docked we were doing so amid dozens, if not hundreds of boats of all sizes. Never saw ONE "oopsie".