My wife and I have been watching a ton of movies in quarantine and it feels genuinely weird to see images of the old world with huge crowds of unmasked people.
There were a few months when I just didn't leave the apartment at all (outside of very basic tasks generally in the evening). When I finally stepped outside one morning, everything just looked surreal.
I didn’t leave my property (house/yard) at all for a couple months. And even then, as my puppy needed more activity, we never ventured to anywhere with a lot of people. When I had to take her in to the vet last month, in my neighborhood’s little downtown area, I just felt completely unsettled. I have no idea how people who have to be out in public places daily do it.
Along those lines, it's low-key fascinating for me to see unintentional 9/11 imagery in pre-9/11 movies. Look at something like True Lies, which treats a terrorist attack and a plane destroying a building as lighthearted action movie fare.
You never see that kind of imagery treated so flippantly after 9/11. 2000s movies with 9/11 analogues (War of the Worlds, Munich, Cloverfield, etc.) deal with it mostly indirectly and always as deep-set trauma.