Honestly, based on a lot of my experiences over the past several years, the customs experiences seem a little too exaggerated. There can be a bit of a queue - at least at BOM - but the customswallahs really couldn't be bothered anymore.
It's the immigrationwallahs who irritate me now, with their stupid and pointless questions. I mean what business is it of theirs why I went to Mexico five years ago when I am simply trying to return home today?