I never thought DST was a big deal until I lived somewhere without it, and let me tell you that sunlight from 5 to 8:30 is infinitely better than 4 to 7:30. What percentage of people are awake at 4 vs 5 do you think?
Where I live we have sunlight from 5:20 to 22:00 in summer. This means going to bed while it's still light outside. We're actually in the wrong time zone though, the sun is at the highest point somewhere around 14:00 in the summer.
Japan doesn't do dst, and when you get to the same latitude as about NYC you get sun times like I mentioned. But even in the states the time zones are pretty broad. New York can have sunset after 8, but Michigan is in the same time zone and the sunset is after 9.