I would emphatically recommend keeping out of Melbourne CBD if you're a photographer at this time (Christmas-New Year holidays): it is profoundly chaotic and unbearable everywhere — not the Melbourne I know. No clear space, pushing, shoving, cheek-by-jowel crowds. Three hours was a long as I wished to spend in that seething maelstrom and then skidaddle out of there as fast as 'Twiggy's' wheels would turn.
A few years ago I spent Christmas Day in Melbourne CBD, it was like a ghost town, I got some great photos of a bare Swanson St, an old guy feeding pigeons in Bourke St Mall will not another soul in sight... Best Christmas Day I had had in a long time. A far cry from the insanity of the days on either side of it!
My goal in life, is to be as good a person as my dog already thinks I am.
I do heaps of shooting in Melbourne. The law states that it's all good as long as you and your equipment is on public space and not an obstruction to traffic. Also, if your after shots inside Flinders St Station, go and speak to the station master and they will give you a 60 day photography pass. Apart from that, just use your common sense.