Spanner,
I live at Kallangur and go down the Gateway to get to work. I've been riding that road for the last 7 years and I initially tried following other bikes leads down the the Left-hand safety lane and finished up with punctures too many times. The rubbish on that falls from trucks and builders and plumbers utes tends to make its way to the Safety lanes. I also observed too many other riders being

booked by either

Cars or

Bikes parked at judicious points in the left lane.
I will ride the "Metal Canyon" when they've stopped but only at 30 km/h or less to allow myself ample stopping room for the occasionally nutter, who upon seeing your approach swerves over to close the available space. Most motorists appear to be bike aware and will make a little more room if they think the gap is a little tight. Get the occasional Tosser who thinks it's clever to shout at you as you ride past. (the Air-horn appears to make them pull their heads in

)
Touch wood, I haven't been booked in the 7 years I've been doing it.
A work colleague was given a stern warning by a motorcycle cop for following the motorcycle cop whilst the Motorcycle Cop was threading the needle on the Centenary Highway. (Which they blitz quite a bit from what I've been told).
A favourite spot of theirs on the Gateway appears to be just after the north-bound merge of the southern Cross Motorway with the Gateway and before the Shell Service Centre at Nudgee. Another Northbound favourite is just after the Gateway Flyover Merge with Gympie Road just before the Pine River Bridge. Southbound it is just at the merge of Deagan Deviation with the Gateway at the bottom of the Flyover.
Riding up the middle you will be surprised how many people you spot using their mobile phones whilst driving. Blatantly holding it up to their ears or texting with it on the steering wheel of even better in their lap where they have to completely look down and take their peripheral vision off the road ahead.
I'm not recommending you do any of this, because it takes quite some time to be able to read the "body language" of the vehicles around you. City drivers do drive quite a bit different to Country drivers.
By the way, Welcome to Bris Vegas from another country boy. (Northern Rivers NSW)