I can't answer all your questions but I'll try with some.
My dh and I lived in Melbourne for 2 years, he is an accountant for one of the big 5.
Aussie work very hard, this was a big misconception for us I thought they all worked from 9-5 then went to the beach!
Sayin that they liked to play hard and they are very big on families and you would find his work functions may include you and your family more.
People do tend to commute quite long distances, but then so do some people in the uk so its hard to generalise, we lived 10 mins from the city ant 2 from the beach.
Can't help much with education, as we didn't have ds then, although aussie schools are supposed to be excellent, but there are alot of private schools.
It is a fantastic place to live and to bring up a family, everything is family orientated. In Melbourne they are really into Aussie rules football, which is really fun and nothing like uk football, families go and there is never any violence.
If I had more guts we would be out there, but it is a major transition and very difficult if you have no family and friends over there. However Aussies are lovely and very welcoming and if you can brave out the first six months you'll never want to come back.
Good Luck
Katyjo
xxx