I and many WFH people I know are working more than they were pre-corona, unfortunately.
This is common when people first start to work from home. You feel you have to do more in order to prove that you're working at all.
It's also common to feel that all of the time you were out of the house before is 'work time', so whatever you spent commuting before is now time you should be working.
It's worthwhile trying to fight those feelings and define scheduled hours that you work, otherwise you will find work takes over your home life.
The combination of working from home and having kids out of school is particularly rough. Either on its own would be enjoyable. Both at the same time is less so!
I appreciate the sentiments, but I'm in a line of work where we have to track billable hours. Similar to how lawyers have to do it. I have clearly defined my boundaries, and have none of the problems you have described. Really my main problem is that my higher ups are clearly not taking this seriously and are expecting people to put in the same amount of work pre-crisis. I'm thinking that is probably what a lot of my peers are going through too.