I've read the odd articles here and there that suggest that the savings are largely illusory. Depending on the actual timezone and latitude, the savings in electricity because the lights come on later can be wiped out by air conditioners running more than normal. And there is a cost to the twice-yearly change, too. Timetable and schedule changes cost money. Productivity is lost because, inevitably, some people miss the change-over and, if they don't, their biorhythm is disturbed for a while.
There is also disruption to trade. 100 km south of here, you enter NSW, which does have daylight saving time, and Queensland does not. The border area between New South Wales and Queensland is densely populated, with a lot of commerce and tourism going on. Having a major population centre (Tweed Heads) getting split by DST is awkward, to say the least. It reduces business hours overlap by an hour each day on each side of the border.
There are also places where you are damned if you do and damned if you don't. Here in Queensland, we have a very large north-to-south distance as well as a very large east-to-west distance. Meaning that some people (not in the most populated part of the state) do indeed suffer due to DST. With DST, it is still stupidly hot in those places by the time people eat dinner. (Queensland tried DST for two or three years in the eighties, and then got rid of it again. No DST in Queensland since.)
Personally, I liked DST while it lasted. In mid summer, it is (bright) daylight by 5 am, and dark by 6 pm. I enjoyed having daylight 6 am to 7 pm instead. But people in more remote areas of the state do not.
But the endless back and forth twice a year doesn't make sense to me. Better to pick a time and stick with it all year round. Which, for Queensland, really means no DST. Otherwise, a whole lot of folks up north and out west get shafted.
