Actually, not true.
The shorter circuit is used for the local V8 race while the longer circuit is/has been used for the international races (eg F1 and the single 6 hour race held on new years eve a number of years ago)
The fast kink on the longer circuit (linking Jones and Brabham straights) had a bunch of raised kerbs that don't show up on that track map that tightened up the corner and forced cars to slow (at least a bit!) .. in fact, those kerbs are still there!
The newer, shorter version has a flat out kink which seems to be much more dangerous due in part to the lack of run off. So it's certainly not "duller" in that particular area!
IMO the longer track which included the off camber S bend near Gate 5 and the stag corner at Gate 6 was a much more interesting circuit
CLP