One quote that really stuck with me is from the YouTuber "Practical Engineering"
He was talking about how we often call road construction workers lazy for standing around, while one person is doing the work.
At one point he says something to the effect of "Next time you're working, pay attention to the actual amount of time you spend actively doing things, you might be surprised to realize it's not that much. It's just natural to need time to break and think to do your job properly - the only difference between them and you is your work activity isn't publicly visible"
Similarly I take the stance it's none of my business what people do at work as long as it doesn't interfere with me. Results are what matter, and even then that's between them and their boss.
I've lost count of the times I've watched apparent slackers achieve great accomplishments (and not because they got someone else to do their work). Conversely those who complain about the amount of work they are putting in often turn out to be unproductive (sometimes covering up their laziness with that narrative, or just doing their job really inefficiently).
Another thing I noticed in school is when you're in an exam, take a look around - you will notice nearly everyone is just sitting staring and doing nothing. You haven't entered the twilight zone, they're just thinking, you don't notice when you do it because you're too busy...thinking!!