I have never been in one, but remember oh! so well all the ones in Sydney during the Vietnam war, and I was watching on the footpath.
I would be in one 'if' it was something like the Government would allow 'Sharia Law' for muslims, or muslims wanting Christians banned from areas in Sydney where (they) shop in large numbers(Lakemba) etc.
Anything to do with a Big change to this amazing Country imposed by another group, from another Country....I will be there! every single time......seriously.
I do think P.R's do raise effective awareness, I think people are sick and tired of being told to shut-up-and-put-up.