I saw the move Pathfinder yesterday, and it gave me a good way of thinking about this cure disease ritual - and healing rituals in general.
Viking-born, native raised protagonist gets an arrow to his back while fleeing from the viking 'dragonmen' (another thing I found interesting, and made me think about running a 'human' only campaign, but keeping the races more as races instead of species), and eventually he is discovered by a medicine man. There is plenty rubbing of the mystic salve (tm), some chanting, a girl playing a tambourine like drum.
Then the medicine man blows some smoke into the face of the young viking-born.
After the ceremony, the medicine man says that the ritual was taxing, or that he had to rest.
I think rituals might seem better if they worked like that, than if we shift our doctor paradigm to fantasy past.