My current employer's workday requires only 7 hours per day and the commute time is also around 1 hour up and down that leaves me a lot of time to work on stuff that I love to do. I read books, write code for fun and so on. When it comes to running a family then it matters more since you have dependents that need your time more than ever. Work life balance for me mostly matters on less work that I need to bring home so that I can focus on stuff that I care about.
I also find more satisfaction in doing work that impact people like a patch that helps the other developer in a certain tool and so on that further increases the interest and responsibility in my work that also has a positive feel on my life that I did something worthwhile today. Different people that satisfaction in different ways of work that they are willing to spend time on.