This is a well-known issue that we shouldn't still be discussing in 2011. Any sane JavaScript implementation already addresses this issue, and any responsible JavaScript framework will address this issue for you for the sake of older browsers (e.g. see the jQuery source at https://github.com/jquery/jquery/blob/master/src/event.js#L1...).

To say that we all do this is more than a bit of an exaggeration.