We went to Luna park too! Those types of facades were typical of the early 20th century amusement parks - which is exactly why Boardwalk uses it.
And yes, 3 weeks in Australia (with a visit to
Disneyland) cost >>> than a week at WDW. I won't share the total costs, but for 3 people we spent $4,800 on airfare, and including the points we used for free flights - total airfare would have run $7,600 alone.
That said - I am all for travel beyond Disney - even though we like to go every year, we like to go elsewhere as well. But it's Disney that keeps us coming back.