Somehow I doubt you're going to get a definitive answer on this one!
My two cents is this: Water has a lot of heat capacity and freezes after the land freezes. In other words, your wooden ware on the dock will be frozen before the water freezes. When moisture from the pond rises up and hits your frozen wooden ware it will condense. If you have a screened bottom board in place, that condensation will occur inside your hive and mold is likely. If you put in a solid bottom board in the winter, moisture should condense on it and probably not affect the insides of the hive.
I would be more worried about harvesting honey on the dock though. Bees, stings, bee suits, and water might not be a great combination.