On one of our stays at POR, there was a CM who worked in the food court who made a point of always talking to my DD and asking about her day, etc. (I'm sure she did this with all the kids.) My DD would purposely get in this CM's line -- even if another was shorter -- just to talk with her.
Anyway, upon on return home, I wrote a letter to the Resort Manager and complimented the lady. About a week after I mailed the letter, I received a voice message from WDW thanking me for taking the time to write the letter and advising me that it would go in the CM's file and she would be recognized.
So, my advice is to write to the respective managers of the resorts. It is worth the effort.