There really is no good way for a large power boat to avoid leaving a wake when passing other than signaling, and slowing down to a crawl by the book. People just aren't going to do this. In a narrow, high traffic spot, I always just figure I'm going to roll around from wakes. If you time it right, you can just turn to quarter the waves and then turn again back on course. No huge problem when motoring. Wave and smile. When sailing, most powerboaters have no idea that they will shake the wind out of your sails, cause your boom to jibe, etc. They are not sailors. So maybe we should think ahead and avoid trying to sail a light wind through a heavily trafficked inlet.
The thing that irks me is when a powerboat, with miles of open ocean, thinks he needs to follow my exact course and then come within 100' to pass. It must have something to do with a Pavlovian response linked to always driving a car one behind the other.