I am an AP holder and am in the DL/DCA parks at least once a month, oftentimes more than that. I can say with absolute certainty that the CMs enthusiasm and Disney spirit are often a direct result of how they are being treated.
The CMs deal with cranky, tired, over-bearing and over-demanding guests and their tired children day in and day out. It can be a somewhat thankless job, and I think people often forget they are human and have off days. Im not saying anyone complaining here is treating them poorly, but I think they get overlooked as part of the scenery, so-to-speak.
I always go out of my way to be pleasant to the CMs
ALL of them. Even the one who simply sells me a churro. I find that smiling and greeting them with a Hi, how are you? immediately puts them in a better frame of mind. A lot of people don't even think to ask. I also be sure to say thank you when they are helpful, etc. If I'm in a slow-moving line, I'll strike up a conversation with them.
Even if they seem to be somewhat cranky, treating them well turns it around immediately and I get the magic back ten-fold.
Just a different perspective.