In all my time in aviation, I have never been refused/denied a clearance, except to do orbits of the Sydney Harbour Bridge, which is still in the same controlled Airspace!
Whilst the US has many many more "Major" airports than us, our ones are ONLY basically on the coast, and transiting them is NOT a drama... never has been. Those that are frequently used have their own VFR route, such as "VICTOR 1", as well as the Nowra, and Newcastle VFR lanes. These were there BEFORE NAS... and worked as well.
I cannot see ANY benefits that have come from this "new" system. I have not seen any cost saving passed on to passengers, I have not seen any INCREASE in safety. I have not seen any DECREASE in TCAS Advisory's etc.
We have given your airspace a go.... we don't like it, it doesn't work... accept the FACTS