I spent the first twelve years of my career traveling like a maniac. Supporting sales for high-tech scientific instrumentation. Easily >50% on the road, internationally, away from friends and family. Took a big toll on my health. A few years ago I ripped off the bandaid and changed careers to something with almost no travel. I thought I'd eventually miss the travel just a little bit after some time away. Nope. Four years in, I still get palpitations at the thought of going to the airport. I guess it's something you just condition yourself to doing when you're in the thick of it, like an addict. Hard to break free.