I got into the habit of pressing B, and will probably always press B until I no longer have the option. I don't even use the feature, although I have tried it before. I rarely ever fly, because I almost never have a flying Pokemon on my team. I think it is a nice option to have though, I enjoyed having it. I feel awkward when my character randomly starts running when I haven't pressed B, but like I said, it must have been all of those years doing it, I don't even notice anymore. I was halfway through Kanto when I remembered it.