Others have mentioned it... but ultimately, I think what is wrong with DTD is that there really isn't any reason to even go there anymore, unless you know what you are already going and looking for. And at this point, Everything worth doing is over in the original section of the Village.
Going for your Disney Souvenirs? World of Disney is where you are headed. There are also a couple other smaller Disney Specialty shops still over nearby, such as the Sports store and Tren-D. Oh... and don't forget the
Lego store for all your Lego needs (and cool lego sculptures, right next door to the World of Disney.
How about a nice Counter Service meal? or a tasty Snack? Again.... the Marketplace. Earl of Sandwich or Godiva's. Not really even any options anyplace else.
Ok.... How about a Show? In that case, You've already made reservations for Cirque, so you already know where you are going and when to be there.
Table Service meal? Well, there are a couple options over on the West Side.... but you obviously already know what you want to eat and where it's located because Disney has trained you on the ADR's to know what your options are long in advance.
Disneyquest? Also already planned. You aren't just going to walk up and Discover DisneyQuest.
I Know! you want to have some fun at night? Oh.... I'm sorry.... You can go to a Disney Park, Watch a movie, your pool resort.... or Citywalk. We don't really offer anything for you here.
There really isn't any reason to venture or explore the area under normal circumstances. Honestly, the only times i've walked the length of DTD in my past several trips were either due to where I finally found a parking space.... or the Festival of the Masters. It also doesn't help that for a large number of people, there is absolutely no reason whatsoever to venture over to non-disney retail locations. With airlines charging more for baggage now, Who would want to not only take time out of their vacation to shop at a place they can probably find closer to home, but then take away valuable and expensive storage space in their bags for the return trip which could be better put to use with Disney souvenirs that you can't get anywhere else?