Ever curious i turned up this (even looks a bit like you Bill)
I personally would never be without my boat hook. Someone knicked my very old knackered shaft and I was very reluctant to go boating without it.
It is the only way of grabbing things you can't reach for whatever reason.
Boats, ropes, lock gates, bits of old floating rubbish, even the dog once. I just used one 15 minutes ago to pull the boat in as it was starting to drift out.
I would quite like a keb as well but it's a luxury rather than the necessity of a boat pole.
I disagree with Bill about clearing the prop, although you can hook a blade or the shaft, you generally can tell and pulling the blades round is one way of unwrapping things.
One thing I have noticed is that with my new shaft the pointy bit is longer and it's not as versatile. When i find my round tuits I'm going to adjust it.