One thing that I typically get out of holidays is having experiences associated with my interests that I would otherwise not be able to have. For example: musicals on Broadway typically have more talented casts than musicals elsewhere in the United States; looking at artwork in person is generally more emotionally moving for me than looking at it online; I met some famous people, watched interesting panels, and went shopping at WorldCon; and Disneyland has rides and the opportunity to interact with costumed characters.
I assume if you had interests such that going on vacation would benefit you in this way it would have made your list of benefits of vacations. But that is definitely one thing some people get out of vacations that might not generalize to you.
Another advantage of vacations for me is that many of my closest friends live very far away, and if I’d like to see them in person either they have to visit me or I have to visit them.
The old Thrawn trilogy concludes with a major (and wonderful!) out-of-context problem for Thrawn. The new Thrawn trilogy just has him win all the time in order to set him up as a scary villain for the Rebels TV series. (I understand he both loses a bunch in Rebels and is much less well-written.)