Ours didn't really go down much as both DH and I continued to work and our gas costs are about $20 every other month anyway; however, we this whole mess did manage to help us reevaluate our priorities and realize we would much rather focus spending on experiences than accumulating a bunch of junk around the house.I can't speak for everyone but our expenses went down significantly due to the pandemic. An entire summer of no daycare, less gas and tolls, food costs went down as cooking at home is always cheaper than eating out for lunch, we postponed 5 tips we had planned, and we did way less stuff like the theater, concerts, etc.
Oddly for us, we ended up taking trips that past year that we wouldn't have otherwise taken and have seen more of the country than ever due to two roadtrips, where we were traveling from the comfort of our own vehicle. And we also did a trip to WDW a few weeks ago.