All very interesting. I have had a number of close encounters on sharp bends, but no "strikes". I try and adopt the policy that slow approach is best and when nearing the bend turn into it and increase speed, watching whether the front end reacts enough or not, adjusting the revs accordingly. A slow approach and then applying power gives a twisting rather than forward motion. If I encounter an oncoming boat, I apply enough astern to slow down, hopefully enabling me to see the reaction of the other boat. Failing this I stop and worry about the correction after. Seems to work quite well.
I agree that the use of horns should be encouraged, even a novice boater would realise there is someone round the corner.