I used to wipe down certain things, such as milk cartons which are going in the fridge, even before COVID.
I certainly sanitise everything now.
I use a clean cloth and sanitiser, and literally sanitise the lot. Copious amounts of sanitiser, wipe every single surface of cartons, tins, packaging and so on. Like other posters, I unpack things which I can, eg. items which have been machine packed in the factory before distribution, it's only the outer packaging which has been handled, shipped, and then handled again by shelf-stackers and through the tills.
I buy fruit and veg in packaging which can be sanitised, but do oranges, lemons, avocados and so on individually.
I shall continue to do this for a long time to come, I have never liked the fact that so much is handled before it comes into my clean cupboards/fridge anyway. I am not just worried about COVID, colds and flu are transmitted through touch and pre-COVID an awful lot of people never washed their hands properly after the toilet...why would I want other people's germs on my food? Best way to keep any sort of infection down. Coupled with the fact that it puts my mind at rest and really doesn't impact on anyone else....