I've heard a lot of complaints about it-taking hours to get to your resort, etc.
The funny thing is that in the more than 3 years DME has been around, I haven't read lots of complaints about it taking hours to get to resorts. WHat we've read a lot of, however, is people saying they've heard it takes hours, and so on. It's like an urban legend that has a life of its own.
In fact, there have been very very few "lengthy" experiences where it took people hours (plural) to get to their resorts, at least as reported here on the DIS and other message boards.
The other thing to keep in mond is that almost no one will start a thread that says "DME took a reasonable amount of time to get me to my resort." In the same manner, we've all read threads started to complain about bad housekeeping at a resort, but we'll never read a thread started by someone saying, "The Mousekeeping at my resort was adequate during the week I was there." When things go normally, no one starts threads to address is ... but when things go badly, it's human nature to complain and to warn others.
Hopefully, the amount of good reviews in response to your question should help you feel good and and feel reasonably confident about using DME for your trip.
My personal experiences? I timed it both times. From walking off the airplane to walking off the bus at my resort it was 63 minutes one time and 56 minutes another time. Both times were efficient, comfy, and fun for the kids.
Our next trip is a quasi-celebration of my wife's birthday and I thought of splurging on a car service ride to add a special touch to the beginning of the trip. I talked to my kids about it (they're 8 and almost 6), and they both complained that they didn't want to ride in a car or SUV, but instead wanted the "cool bus" with the welcome video and big comfy seats. I'm a little disappointed that I can't surprise my wife with Edd greeting us at baggage claim and ushering us towards his big SUV, but DME has always been good to us, so I'm certainly happy to be doing that again, anyway.