Being an SSR owner, I did get the

value of the question about the proximity of DTD to SSR.
Personally, if you are offsite/local and have a PH ticket or AP, ride the bus if you need to. I do not think that offsite guests take up SOOO much space on the bus if they park at TTC and ride the bus to AK or a resort for dinner. And from the way the ticket spiels on Disney's website is worded, they can use the transportation.
As far as the SSR situation, for onsite guests going from a park to DTD or offsite guests doing the same, I have no issues. Sometimes it is just faster. If you have a dinner ADR at DTD and are at a park, usually the quickest route is to bus to SSR, get off at Congress Park, and hoof it over to DTD.
The ONLY issue I have is that Disney specifically stopped running park buses to DTD to avoid people parking at DTD for free and then taking WDW transport to the parks. Then they created a big old honkin' resort close enough that people could do that with only an added short walk! DOH.
I am not sure how they could correct that though, without someone who SHOULD be able to use the transportation getting shafted.
I would like to see a resort ID required to go down the path to SSR and the one to OKW, but that is more for security than the buses, since we have never had a problem with large crowds of people riding the bus from CP and we stay in that section every time we go to SSR.
I mean, they check your ID at the guard shack when you drive in, and don't allow non resort guests in after a certain time at night, but then you could drive over to DTD and walk in??? Bizarre.
