My introduction to the heady world of J came earlier this year. It was nice to get lounge access, priority queues, tags on the baggage and so on. Cathay Pacific even had a sort of traffic director in Kansai, holding up a stream of Economy passengers so I could saunter ahead of them, blowing them kisses and waving. (well, not really, actually I felt a little embarrassed)
Apart from the guff on the Qantas site, the main benefits of J are that you have a lot more room, the flight attendants have time to give you better service, the seats are nicer and you generally won't have to battle for toilet time.
For a window seat dweller like me, it also means I can get up and out without having to create major disruption.
Not that you're going to have a real lot of time to enjoy the service in the hour or so to Brisbane. Still, it's a pleasant experience, and the thought of those status points racking up adds an extra sparkle to the day.