It's never gotten old to me, even going back to the Passport days, because don't care about the "thank you" itself. I don't view it as an employee genuinely thanking me for my loyalty (seriously, why would they care?) -- rather, it is an acknowledgement that the employee recognizes the services they are obliged to provide, and I don't have to wonder whether I didn't get X/Y/Z because someone wasn't paying attention.