I don't go overboard and get something fairly healthy, like a grilled chicken and a diet coke.
Anyway, I've used the drive thru at Mcdonalds three times in the last two weeks. I've noticed that the employees have been doing exactly what they are supposed to do, the've been courteous and friendly. Nothing special, but simple things like acknowledging that your a person (lol) with a geniune "hello", making eye contact and giving a geniune "thank you".
I really hate it when they hand me my food while they are looking another direction, turn away and close the window.

In addition what has struck me, is these have been young kids, teenagers, typical fast food workers.
I guess what I'm gettting at is that it does make a difference and makes me more likely to return.
What are your experiences?