Modern ANZ ones also have the plastic coating as well. It seems to be a more recent introduction though so there are still plenty of non-plastic-coated ones. Is this also the case for the UK/EU ones?
I, at least, try and dispose of any non-plastic-coated plugs though.
You can still find old lamps and stuff that don't have coated prongs, but I don't remember seeing a consumer electronic that's uncoated for at least a decade.