Anzac Day IS a holi-day (you folks call it a vacation). We all get the day off (except self employed people like me who are working).

I would argue about the term Australia's holiest day. It is obviously a special day of rememberance to those who fought in the war and for their families. The country acknowledges the pain and suffering the diggers went through, even the folly and futility of conflict and the lives lost.

..but a holy day? I don't think so. The day is unconnected to any Christian celebration (or any other religion for that matter).
I think Christmas and Good Friday remain at the top of the holy day list still.

I hope I'm not being too picky