Unless you end up at one of the DTD hotels that is very close to Downtown Disney, there really isn't much advantage to staying at these hotels.
They no longer have EMH (except Hilton), they no longer use Disney transportation, and you get none of the other Disney perks such as charging to your room from the parks.
Some of the DTD hotels are nice, but just going 1/2 mile further to the hotels along 535 will give you a lot more options, and probably save you additional money. For example, Cypress Pointe is very close to Hotel Plaza Blvd, but has bigger rooms for less money than a lot of the DTD hotels.
Also remember that getting to Downtown Disney doesn't help much for transportation since the buses leaving there only go to the resorts.
I just don't see much advantage to the DTD hotels, feel free to correct me if I'm wrong.