We're not really big city people. I lived in Toronto for a few years when I was a young man and it was a lot of fun at the time. Even then the traffic was absolutely dreadful, now it's even worse. Big cities come with a substantial cost of living. I remember having to pay to park multiple times per day, even just to the grocery store or to pick up dry cleaning. Basically, there was only time during the weekdays to work and commute. Depending on your line of work, the frenetic pace in Toronto can be really motivating, however.
Sydney is absolutely a fantastic world-class city, so I'm not going to say that I wouldn't want to live there, only that I can't.
My family and I absolutely love the beach and ocean. Living in Canada, I'd work 48 or 49 weeks out the year and the rest of the time, in the winter, we'd travel to a warm locale like Hawaii with a beautiful beach to recharge.
Moving to Australia is a little bit of flipping that ratio around. Why not live in a place that has what you really want rather than visiting the beach a few weeks per year? :)
We're lucky to be going on this adventure and will appreciate and enjoy it as long as it lasts.