Man, I can't believe some of the posts I am reading. Yes, these people chose to build on the river, but it was their property to do with as they please. I think they have a right to ask that you respect it. They have money invested and spend money on a regular basis for improvements and conservation along that waterway. What gives you yahoos the right to come out there and throw wakes through their camps. They are not asking you to slow down year round, just while this water is so high.
It doesn't take a rocket scientist to realize the water is high and that requires special precautions. There is debris moving through that water that you may or may not see. The high water has changed the landscape and you may be running over some underwater hazard. The wake zones are for your safety as well as the protection of property.
For the record, I think there should be signs posted, or there should be someone at each launch handing out maps of the idle zones. You may have a defense in court, but I wouldn't count on a local judge taking pity on you.
How about just being a sportsman and respect the rules? As for what other people do, to quote what your mama and daddy used to say - if those people go and jump off a bridge would you do it too?