Daylight saving works well for places that are closer to the poles than the equator.
If you look at the whole world and where daylight saving is implemented, has been implemented and now discontinued or has never been implemented you will find that almost all of the countries that observe daylight saving are a above cancer or below capricorn.
Australia is very large and the relative lengths of night and day are quite different depending on latitude.
Simply put, daylight saving will always be a pain in QLD due to its position and shape.
There are now and always will be time zone differences between the eastern, central and western areas so having NSW/VIC/TAS different to QLD is no big deal.
P.S. I found a map to demonstrate this.
http://en.wikipedia.org/wiki/File
aylightSaving-World-Subdivisions.png