Touring I have only used maps, because of the gps/battery conundrum (sp?) and usually sort of know the route off by heart, or just go from town/village to next town/village by signs/compass.
I am going to give Audax a shot in a few weeks, so would like to use a gps to assist in swift progress on the navigation front; I am slow enough as it is, and I don't need navigation errors slowing me any further.
Both maps and gps have their merits IMO, and neither should be poo-pooed or heralded over the other.