The best thing about Changi Airport is the near total lack of lines.
Each set of gates has a metal detector type arch for an entrance and pretty uniformed security gals who will walk around randomly to passengers seated in the boarding area and politely ask to wand you.
Last trip there, the testosterone in me was shouting "You can do a lot more than that, honey" but the head with the brain managed to drown it out with a polite "Yes, ma'am, you may. Shall I stand?" She just smiled and said I could remain seated.
Schiphol is my personal favorite in Europe. But nothing outside of Asia comes even close to Changi.