However, they only show roads - not paths. The clever bit - if you switch the view from "map" to "hybrid" though, you should be able to spot most paths - especially if you know the area. And you are not restricted to plotting routes on roads. Kirsty and Clare have used this technique to work out the length of routes around their local park on paths.
And Helen pointed out to me that the tool also shows altitude - useful if you are comparing routes form a hilliness perspective.
BTW, I don't recommend saving and sharing routes with others that go from your home from a safety perspective.