I think it's discipline rather that appreciation of having a job and taking personal pride in their work.
I'm not making a blanket statement, but I think if one is in a family with a stay-at-home spouse, the pressure to share the chores increases, the need to mow the lawn is always there, the honey-do list grows, the desire to do it now and save the weekend for play, etc.
For the single, solitary worker, perhaps the impact isn't so extreme, except for the loss of in-person social contact with others, which improves manners, interpersonal skills, civility, one's attire in public, etc.
-PJ
If I had a wife, I’d tell her, “Honey, I’ll mow the lawn (clean the gutters, whatever) AFTER my shift ends.”