I think it's different for everyone. I travel to learn about other cultures, other people, and about myself. I met a really interesting ultrarunner who wants to travel to every country in the world - a feat I am definitely not interested in. (Hello, why would I want to visit Human Rights Abuse Extraordinaire China?) He also travels in a very fast way - a country a day, three days in a country, running across a country (sweet!). I said I don't like traveling fast, I prefer slow traveling, that way you get to know the culture and the people.
Traveling is about so many things but if you move to fast, you miss out on a lot.