Never known a Shaman or had anything to do with Shamanism but have read some things about it. I find it a bit scary, anything that invites 'malevolent spirits' frightens me, even if I know, logically, they do not exist!
However, each to their own. Shamans don't bother me, no Shaman has ever tried to evangelise me. As I said, I've not met one. I enjoy fantasy but it has to be friendly and beautiful, I've not worked out how to get into that so far but if I did, I'd know it was pure fantasy. Authentic Shamanism would, I think, freak me out.