Just encountered this problem when I changed a label on an Attribute and then found I had to go and change the Label field on every product that had this attribute in order to get the new label displayed. It would be nice to at least have the option to propagate the changes, perhaps only where the existing value is the one that has just been replaced. For example, I changed the label from Volume to Size...so it would have been nice to ripple the change to all products with this attribute and a label of Volume for it.