At first glance, it looks like a POS meant to keep the riff-raff, middle class and poor from annoying wealthy waterfront landowners by denying them access to public waters. If you guessed it was sponsored by a Republican, you'd be right.
Well, in two sentences you've tried to define the problem in terms of economic class and partisan politics. That is unfortunate because there may be legitimate underlying issues that need to be addressed which may include the rights of adjacent property owners as well as public health and safety.
I know there was a recent flap in Seattle tied to one or more public roads ending at the edge of Lake Washington. These were extremely small and located in neighborhoods with narrow roads and no parking yet there were folks wanting to establish those locations as public access. No parking, no trash, no sanitation and no after dark limitations/security.
Then you have situations like River Road along the Puyallup that attract hordes of rec fishers during odd years such that No Parking signs have been installed to prevent unsafe shoulder parking and businesses across the road have had to police their parking. Scary to watch guys with a rod in one hand, fish in the other, try to waddle across four lanes of 50 MPH traffic in their waders. I suspect it was a similar concern that resulted in the State Dept. of Transportation to recently close off unofficial parking along the Sky even though cars were well off the highway.
Rather than simply throwing up an "us vs them" version of your first glance an understanding how this fits into some of our other access problems probably be helpful.
On a personal level I have met with my State Senator (R) and brought to his attention how past Legislative sessions have raided the dedicated account (RCO) funded by the highway portion of the gas tax boaters pay on their boat fuel. When I brought this to the attention of my State Representative (D) last year she basically blew me off with the explanation that they "just had to do it." In short, they decided that a dedicated account established via the Initiative process intended to provide, improve and maintain boater access was simply too ripe to not pick (raid due to their need to solve other budget problems). Oh, that particular legislator is now no longer settled in the hallowed halls of Oly.
So, become informed and address issues to your legislators. I've given you one that particularly frosts my butt. No more raids on RCO monies and, oh by the way, how about paying back the millions raided over the past several budget sessions?