Travel is a set of unique experiences that form unique memories. Part of what’s addicting and pleasurable is that it helps slow down the perception of the passage of time, among many other positives.
It’s also self reinforcing in that when you think back, you tend to disproportionately remember travel vs other experiences.
There’s clearly a lot more benefits than that, but it certainly seems like a significant factor.
I recently traveled by bus not exactly by standards, in a more modest area. Before that I read some literature, which had as characters normal people, with some life situations in which normal people face. It made me feel different that two-hour road, I saw people differently, I felt a little like in one of the stories and I enjoyed.