Odd question, I know. I fly a lot, so I spend a lot of time in airports.
I'm particularly fond of Chicago O'Hare [ORD]. Plenty of food and the walkways between terminals are fun.
I also enjoy Long Beach, CA [LGB]. It's super tiny, you just walk onto the tarmac. There's no baggage claim. No jetways. It's quaint.
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I've only been to Sydney, London, Hong Kong, (some airport in LA) and two local airports, but it would probably be Heathrow, because if memory serves me correctly, it's organized pretty well.