I agree with all of the above, and I'll add something, too.
I've read numerous horror stories, also, and, regardless of airline, almost every single one of those horror stories was a direct result of the guest having unrealistic expectations.
My favorite was the guy who made a HUGE complaint on the message board ... his complaint was that his checked luggage wasn't waiting for him inside his room when he checked in. He b**ched and moaned how his bags didn't arrive in his room until 90 minutes after he checked-in, and that he wasted all of that time waiting for it. TWO THINGS WRONG WITH THIS: 1) The DME materials mailed to every guest clearly explain you can expect your bags to arrive about 3 hours after you check-in at your resort ... so in that guy's case, the service he got was BETTER THAN PROMISED (got the bags in 90 minutes instead of 180 minutes), yet he portrayed his experience as a horror show; 2) Disney clearly explains that your bags will be delivered to the inside of your resort room whether you are in there or not, yet this guy thought he needed to sit and wait for them, and thus wasted his own time.
Another of my favorite horror stories is one I've read a few times, each time written by ... forgive me ... a complete idiot. I've read of people not realizing they wouldn't have immediate access to their checked bags and complaining that they had ALL of their infant's diapers and formula in there, or that they had their necessary prescription medication in there. SO yes, that's a horror story all right, but the fact is that Disney clearly states you won't get your bags until 3 hours after your resort check-in. Now, failing to read the DME info booklet doesn't make someone an idiot ... but packing ALL of your diapers, formula, or prescription medications in a checked bag sure makes someone an idiot! I wouldn't be caught dead packing such stuff in checked baggage no matter where I fly! It has nothing to do with trusting DME or not, but has everything to do with trusting that the airline won't misdirect my bags.
A whole other class of horror story has to do with delayed bags. Look, no system is perfect, and I'll bet a case of Mickey bars that Disney has occasionally but very rarely caused delays. The problem is that in many cases of delayed luggage, Disney is the HERO and not the villian. FOr example, if your airline flies your bags to MCI (Kansas City) instead of MCO (Orlando), it will take a while for the bags to be flown to MCO, and then DME will deliver them to you. The airline delayed things by about 6-8 hours, you get your bag or bags really really late, and you blame DME when in fact in this scenario it was 100% the airline's fault by putting your bags into the wrong plane while still at your home airport.
Disney's been doing DME since May 2005. It's been wildly successful. They know what they're doing, and they use a pretty high-tech system to route and track the lugagge ... briefly, each DME luggage tag has a barcode, each bag is scanned 5 separate times between airplane and the inside of your room, and the DME luggage delivery trucks themselves are tracked by GPS.
ANd, just as an FYI, you definitely don't want your bags tagged at your home airport destined for ORL ... ORL is the Orlando Executive Airport (also known as Herndon). Orlando International Airport is MCO, so named because it was formerly known as McCoy Field.