In my experience, a lot of millenials that constantly talk about traveling and how it "fulfills" them are generally trying to replace that empty feeling not having kids has left them with. It's a biological imperative, after all. The one constant you typically hear from people with kids: "i'm exactly where i should be in the world."
In my experience, parents are the only ones who seem to feel this desperate need to push their lifestyle on others. I'm quite happy with my life and although I'm happy to discuss my choices, I have never once felt the need to denigrate those who choose differently.
I once traveled every few days/weeks for a year wandering around South Asia. I had a similar realization that traveling is amazing in so many ways but you begin to establish a new normal. The way to break out of the ordinary is through your mind - books, meditation, breath work, etc.
