Number one, the norm for DME luggage delivery IS 2-3 hours or so. Are there experiences outside the norm? Of course! But remember, these are exceptions, not the rules.
Number two, airlines delay about 10,000 pieces of luggage PER DAY in this country. Which leads me to ...
Number three, no matter where I fly, I ALWAYS pack a carry-on with 24 hours of supplies just in case the airline delays my luggage. It's just a smart, self-protective way to travel. And believe me, when we went to WDW with my daughter still in diapers, we had LOTS of extra diapers in her carry-on. We didn;t do this because of any possible DME delays, we did this because of possible AIRLINE delays. Like I said, we pack the same way no matter where we fly.
Number four, I think DME is wonderful. It's been around just over a year now, and averages between 6,000-10,000 users EACH DAY. I love the idea of not having to mess with my checked luggage. It's really quite magical.
Number five, if you think there's a risk of DME luggage delivery waking you up, then let the front desk/Bell Services know to hold your luggage until the next morning. Don't bother telling this info to the DME people at the airport, because once the luggage gets delivered to the resort it's the resort CMs that actually deliver the luggage to your room.
Number six, WHY DID I NUMBER THESE THINGS???