There is the North Sea Cycle Route, which traverses the countries that border the North Sea.
http://www.northsea-cycle.com/default.asp
I rode part of it during my tour in The Netherlands and Belgium last September. I'm not sure to what extent the route has been signed or developed in the other countries along the route.
As for the original question, we can only HOPE that bicycle touring would become so popular in the USA that it would seem mundane.