To start off, i have used a cane since the age of 5. I am 30 now, and I am totally blind.
For those of you not wanting to advertise to the world, there is something that you are forgetting. Having a cane tells people that you might not be able to see them. For example, when someone is driving a car, and they see someone walking across a streett, they expect that person to react a certain way. Now, if that same person sees someone walking with a cane, they might think to slow down or pay a little more attention because the cane tells them you are blind. This is one of the reasons I am against people putting odd colors on their canes. I think all canes should look the same, so the public will learn what they stands for.
I personally don't use a cane while doing sighted guide; it tends to get in the way and I wasn't taught to do it that way. I do keep my folding cane on my belt, and I can pull it off and move around on my own when I need too.