The bus hubs at DTD are only good in the afternoons and evenings.
In the mornings, they do what is called Dead-heading or divert buses from carrying passengers to the parks, to a resort area if enough people are sitting waiting for a bus.
I have waited up to 50 minutes one morning, before I knew that.
In the evenings, it is good to come back from a resort without having to remember which park to go to, depending on how late each is open and still taking people back to resorts.
DTD buses run until 2 am, so it is a great way to get back to the resorts that are located near DTD, such as SSR, THV, OKW, POR, and POFQ. I am not sure about the off-site hotels that are located near DTD - how late they run. But you would certainly be able to walk to a few of them; you can see them from the bus hub.