I understand your frustration, in my experience there's less of a wake if they come close to your boat on plane than if they let out and the boat sits down in the water some.
That's the excuse they make for roaring by people who are fishing. But it is amazing how many of them get upset if you follow them and then roar by them on plane as they are fishing.
Im not saying I approve of someone being a jerk about it and I feel it's never appropriate on the main lake where folks can steer away from you. However, the OP raised a question about creeks... where there is no way to avoid other anglers. In this case I would rather someone go VERY slow or moderately fast on plane. If someone half heartedly slows to a moderately slow spreed or if they slow down too late, they throw off a lot more wake than if they stayed on plane.