I can count on the fingers of one hand the times I used the horn on any of my motorcycles in two decades of riding (>100kmi, various situations, not much commute, less in the dark). In dangerous situation where honking might have helped, I typically was busy to either break or steer out of harms way. Aside that horns on m/c tend to be meek. They seem to be installed only because some law requires them.
I would if I could! Sometimes it's kind of funny - you see a few sets of ears poking out amongst the long grass of the road verge. A couple of beeps on the horn and suddenly a mob of wallabies emerges - and often hop straight across the road rather than back into the bush. That's the main use of the horn - to flush out the daft critters who may well otherwise jump straight into your path.
