I'm not trying to be rude or anything but for the last time , please ... please ! Just withdraw your funds from exchanges . I'm not sure what you got to lose here , this procedure will only secure your coins and make you safer.
People never learn, you said "I assume not otherwise you wouldn't keep your funds in an exchange (I'm not speaking with those who kept their bitcoin for short period of time , those accidents happens but I'm mostly speaking for those who had their bitcoins laying there for weeks/months)".
Do you remember the mt.gox case? I know some people lost few hundreds/thousands bitcoin on gox and they have also lost few hundreds of bitcoins on bitfinex.
This is why I said people never learn:).