It's always nice to hear about a GOOD dealer once in a while. Be sure to fill out your survey and take care of them as they did you.
FYI-
Nissan has recently changed their scoring methods on surveys. Anything other than "EXCELLENT" counts against the dealer. They call it "top box scoring", so if you really want to get on their good side; score them as high as possible in each question (if you can honestly do so). Dealers do, in fact, receive copies of the surveys once returned. If you rate them "EXCELLENT" in all categories, they will probably remember you and would be more likely to "take care of you" if you needed something in the future.