I think ANYTHING in excess is not a good thing. Let that be drinking, recreational drugs, studying, traveling, working etc etc.
Have to agree, whether we like to admit it or not, that probably true, even for travel
I love to fly, and never want to board a plane thinking "Oh, god, not another bloody flight." I agree, even an excess in travel, sad to say, isn't a good thing.
Gelli, for someone like you who travels so much for work - do you ever find yourself bored/fed up/disgusted with travelling?