Where I work it's a part of the job description that we know our regulars and know what they drink. During the morning rush I'd say I can tell you the names and drink of about half of the customers that come in. When we have our secret shoppers they check to see if we recognize people in the line and we get points taken off if we don't.

However like the lady I posted about above I don't know their drink if they never come into our store!