I am sorry you had a rough time. The unprofessional and unDisney attitude of some CM's is what would upset me the most. However, I agree that a letter with legitimate complaints about particular things within Disney's control will get you the best response. If you wish to complain about a particular CM, state name, physical description and location of CM, date and time, for best results. I also agree that stating the nice things CM's did for you will also help your letter be taken more seriously and if a manager asks those CM's for a report, they will help you, too.
Possible complaints:
Major Complaint- Reservation problems- I don't know if this should be addressed to
AAA or Disney. I'm not sure who was responsible in the end when you said "someone took ownership".
Major Complaint- CM telling you it's okay to use a stroller. See this confuses me in a way because when I was a CM I did see a few children w GAC's in strollers (or walking in certain cases) and we were instructed to treat them the same as any special needs guest. Anyway, state the facts about this and elucidate on the poor treatment you received. Occasionally we would instruct people in strollers to "park" them but once we saw a GAC card, we would say "I'm sorry, right this way." That is what should have happened. And if the rules are changed that strollers cannot be used, you should have been informed.
Major complaint- Unprofessional attitude of CM's. CM's should always speak and act as if they have Walt Disney with wings sitting on their shoulder. I hold CM's to the highest of standards and I can say that because I lived it. Is it tough, oh yes, but that is the Disney way. CM's are trained to make the experience magical for every guest- keeping them happy unless it interferes with the safety or happiness of themselves or others. This is a very serious complaint in my book and you should be as specific as possible.
Dirty sheets. Sheets *must* be changed before every new guest. I would have called the front desk immediately and said I need new sheets or a new room. They could solve the problem somehow. Possible complaint here.
Again, Disney does take complaints seriously, but unfortunately because of people abusing the system, you bear the burden of proof.
Good luck to you! Hopefully Disney will do something to ameliorate the situation.
Slightly OT- I think Disney needs to decrease CEO pay, increase CM pay and hire people who are more qualified, not just a 16 year old kid (or any age) who thinks he can hang out at Disney and make a few bucks for the summer. Most CM's take training more seriously than that.