Sorry that was a response to a question from EverydayJourneyman above that I forgot to quote.
A long distance really is, for some of us, more than just walking. It's more than just another vacation as well. Vacations are very temporary pleasures. Thruhiking can be, and has been for many of us, life altering activities. Attitudes toward the trail have changed over the years. I suppose forums like this encourage the cynicism. Talking from the heart is a good way of getting attacked, so it's easier to just say it's just another day in the woods. Yet so many of us go back, over and over again. Why? For some people a long hike can be a pilgrimage. It can be a spiritual journey. It can be a way of getting in touch with our most authentic selves. It can also be an alternate lifestyle that is more interesting than holding down a 9 to 5 gig and paying off a mortgage. It can be a way of belonging to a community of interesting insane people where we may fit in a bit better than we do in the mundane world. It can be a physical, emotional, spiritual testing of who we are and how we want to live our lives. It can be a way of proving something important to ourselvelves. It can be a way of feeding that part of ourselves that needs contact with the natural world.
People hike the long trails for a lot of different reasons. For some people it's just a walk in the woods. For a few of us - it is much more.