not sure myself , I imagine the disruption makes a difference ,but then again is it a negative difference or a positive one . folks used to tell us to be stealthy in the timber and use long rods and don't get to close to the timber or you would spook the fish . we hammered trees with the boat a many a times and yanked fish right off the tree with 5 foot rods within seconds of the impact . it might serve to "wake" them up per say and depending on how much boat traffic they see it may not bother them much at all .....in my case the jury is somewhat out