Also ducks make a decision where to feed based on the wind for safety also.

They set in the calm end of the pond/lake, yes, but the other reason is for quick and safe escape from predators. They will jump if a predator comes and the wind will push them out over the water instead of over the land where the predator is likely to be. Over the water they can gain distance from the predator and it cannot persue them.

So the calm side of the pond/lake has many valuble options to waterfowl. They are in calmer water to feed, they are out of the weather, and it plays into their plans for a quick and safe escape.