Its getting late but can clarify when my head is clearer in the morning. But yes there are benefits on the really low income brackets but not so much when you make a bit. So to say the tax free bracket jumps from 6K to 18K is misleading when the LITO drops from $1500 to $445.
If you are on 80K you are paying basically paying the same amount of tax from the 2011 - 2013 F/Y at approx $17,550
The effective tax free threshold for 2012 is really $16,000 going up to $20,542 in 2013 and $20,979 in 2014. But the tax rates have increased moving forward to make up for the increase in tax free threshold.