Revenge travel is a stupid name but I think the concept is sound, it’s not so much that people are traveling more often, they’re just all going at the same time and to the same places rather than being spread out.
For example, say there’s 3 families that normally go for a week once every couple years, pre-Covid they ended up spread out so 1 family went per year over a 3 year period, family A missed 2020 so they are going this year, family B missed 2021 so they are going this year, family C would normally go this year so they’re going this year also. No one’s going more often than normal but because A and B have changed their schedule it’s 3 times the normal demand.
The other big factor is it’s still harder to travel outside the US. We used to rotate between WDW and Europe every other year, with Europe so difficult we’ve been to WDW in 2019, 2020, 2021, and we have another trip planned for Jan 2023. We haven’t travelled more (less actually) but with our other destinations so hard to get to we’ve spent twice as much time at WDW as normal.
I don’t think this will last long but 2022 and 2023 will probably see more demand than they’d have seen without Covid.