A discussion of thru-hiking is probably more apt to the Long Distance Hiking Forum than here, but I often listen in on thru-hikers and what they say about the experience -- and those who complete the trail (or any very long segment of it) contend that they see and appreciate most of their surroundings as they walk. They just start walking earlier in the morning than most hikers, and walk until much later in the day. Mid-days, they still take breaks and lollygag around.

Mainly, those who don't appreciate being in the wilderness for months on end, quit early on. The finishers are a self-selected group who love to hike. And hike. And hike.