This is pretty corny:
Every year I go to Burning Man. It's the only "real" vacation I really take. I completely detach. No phones, no television, no news from the outside world, and except on days when I have volunteer shifts, no sense of "time".
It's pretty amazing how much you end up detaching from "default" world (which is burner parlance for the world outside of Black Rock City). By a few days in, default just feels impossibly far away, like none of it matters whatsoever, and you are completely detached from it. BRC is on another planet, and Default Planet doesn't matter.
All of the social conventions are different, all of the interactions or somehow (although indescribably, at least for me) different. Everything just feels different somehow.
Do most people get that feeling on "normal" vacations?