They exist for sites you've never been to before, you don't have to do anything to a fresh browser install to make them work, they are browser-indepenent (I don't use or like chrome personally), and you can use them on any computer at any time. I know they are always helpful for me when using public computers.
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What advantage do bangs have over Chrome's ability to detect and add search engines to the Omnibox?
They exist for sites you've never been to before, you don't have to do anything to a fresh browser install to make them work, they are browser-indepenent (I don't use or like chrome personally), and you can use them on any computer at any time. I know they are always helpful for me when using public computers.