Upon further reflection it is very difficult for me to guess what percentage of people experience what evidence and of what nature and intensity. I do not feel comfortable generalizing from the experiences of people in my life, for obvious reasons and some less obvious ones. I believe this doesn't ultimately matter so much for me, personally, because what I've seen implies it is common enough and clear enough to require a perhaps-heavy explanation. But for others trying to guess at more general base rates, I think I don't have much insight to offer.