Feeling zero pressure to smile has done wonders. I hate having to fake a pleasant response at the sight of other people. I'm being mildly facetious here.
The biggest one for me is that even though I still have to physically go to and from a job the same as pre-pandemic, I'm getting sick way, way less. That's the entire point of the masks, yes, but we are doing it for covid-19.... when it actually helps with halting the spread of lots of other things, like cold/flu. And I really have benefitted from it, as someone who's immune system is terrible.
My biggest post-covid-19 hope is that the wearing of masks in the USA becomes more normalized for the long haul. It's not okay how we cram onto buses/trains during cold/flu season and get each-other sick like we just don't care. People don't have to be feel miserable with preventable illnesses multiple times a year if we could be more respectful about how we interact in public, and masks can help a lot.