I think it's better classified as animism, though there is certainly some overlap.
But while Shinto priests' roles in the religion can be compared to that of shamans, Shinto doesn't actually place that much emphasis on them - individual and group practice also play a big role.
Interesting. It sounds like in shamanism the spirits are more "real". In Shinto it seems like a commonly agreed-upon belief that they exist. Shinto relishes the belief whereas Shamanism relishes the experience.
Sounds a bit like Carlos Castaneda and shamanism in general, no?