The 던 form points at something you used to do habitually, and 하다 keeps doing exactly that. Every line here is reassurance or resignation: just do it the way you always have, we have always got on like this so let us not change it, you remember it better if you do it the way you normally would. Contrast the past-form 대로, which follows an instruction already given, and the present 대로, which follows things as they unfold.