Did you know that in addition to returning to a sane user interface, the Mavericks Contacts application also adds the ability to paste a full address in one step? Just paste an address (single or multi-line) into a contact's street address field and the application parses it for you. It doesn't pull the contact name or phone number but the days of individually pasting street address, city, state, and zip are over. David Chartier over at Finer Things Mac even has some sample links to try this out.