I like to exploit these things but not because of autism, but opportunity. The shorter queue at the cinema that no one joins, for example, because they didn't notice because of the big queue.

It is worth taking note of what other people are doing though. Maybe not so much at airports that should have everything running like clockwork, but some places communication of new information is poor, done verbally so not everyone hears. It is worth asking people "why you doing that" sometimes.