I don't call it a gimmick feature, I want to login to my mac with just my fingerprint, I want to assign special permission for certain information and folders that I can have access by only fingerprint. When I want to make a purchase online, I want to be so easy that with my touchID I will have access to my stored credit cards so I won't need to refill all information.
For me, for my need macbook pro with touchID makes the perfect sense. If that happen next update, im totally sold.