On my last few Intl arrivals, I have found (a) no queue at customs, (b) grab the first smart gate machine you can - I find it odd that people walk past all the empty machines then to just have to wait in a queue for the couple at the actual gates, (c) bags came quickly, (d) no queue for the exit. While your experience may vary, it seems the staff match the customer need at the moment. In and through in under 20-30 mins with bags.