The environment will suffer greatly in the few years after life returns to something more what we're used to. I think people will make up for lost time, travel, consume, litter and trample anything in sight. Hypocritically I'll probably be one of them.
In general I think any lessons we (as a city, country, society, species, all of us) need to learn about this will be forgotten all too quickly. Things like health and hygiene, how fortunate we really are to assume such a level of health we've grown accustomed to.
I think it's been a good opportunity to do some spring cleaning on your social circles and facebook though. Found a few secret anti-vaxxers and hoax believers in mine.
On a more wholesome note, I hope to maintain the extra gardens I've had since the start of the year. I've learned a lot, really enjoy it and find it really therapeutic despite the bloody caterpillars.