I've been to Sydney a couple of times but only for a day or two both times. It's on the large side compared to quiet old Perth.
I worked in the middle of Sydney for several years and lived a 10 minute train ride away. I know that sounds amazing (being able to travel to work, door-to-door within 10 minutes) but it's not all that it's cracked up to be.
I now live in the Blue Mountains but travel at least an hour each way to get to/from work and I love it.
Coming home is peaceful and now that we're coming into winter, the smell of wood fire is in the air.
I guess the older and crankier I get, the less I want to be around people, noise, pollution and traffic.