I live in a suburb of Ottawa, and have noticed the same thing here. It's a fairly well to do neighborhood, and people used to be fanatical about yards; now they're quite rapidly deteriorating. One uncomfortable hypothesis I've formed is that a lot of people are unable to tend the yards; seeing someone else notice it as well is troubling.

I've also noticed a lot fewer people walking; although technically this is a suburb, it's a fairly walkable area, and even during the lockdowns summers typically see a lot of people out and about walking to and from places, or just enjoying a hike through the some of the trails here. Again, if a lot of people are disabled this makes a lot of sense in an uncomfortable way....