Yes, I've done small parts of the route on two different occasions. First time I quit due to problems with my feet, the second time I quit after problems with the heat :-)

I never planned to go the full camino, as most of these routes are quite long. The one that starts in France is about 800 km (500 miles) I think, so that will be a full summer holiday and probably a few weeks off work at best. Not ideal to walk during the height of summer either, as the heat can be brutal.