I take them out more often to be handled than to be fed. Once they are in their tub, they're going after whatever it is that comes in there, the rat, my hand, whatever. They associate being taken out of their cage as being taken out of their cage, and they associate they're feeding tubs (which is all I use their tubs for) with eating.
That's what works for mw and my snakes, I'm not trying to push that on anyone else, or start an argument.