Maybe not in the south, where the length of daylight doesn't change as much, 
but up here in the north, we go from 9 hours of potential daylight to 15 
hours plus in the summer.  Sunrise goes from 7-33 at the end of December to 
an uncorrected 4-11 in June.  Daylight saving time definitely puts an hour 
of daylight where more people use it.  Right here at the Eastern edge of the 
Central time zone, we could probably go forward another hour for the summer.