The above is correct. Although "on property", SOG is not a "Disney Resort", so you do not get the "+10" on ADRs. Also correct regarding the TTC for MK and EP. I don't really mind, though. For the MK it's pretty much 50/50; walk to the Poly and have a stop at the GF or take the express mono direct from the TTC. I actually prefer the ferry to either. And I've always enjoyed the mono ride from the TTC to EP. One other "hidden" cost of SOG is that you don't get free parking at the parks if you drive (plus there's a $5/night parking fee at SOG). So, when working out cost differences, if you plan on having a car and driving to all of the parks, you kind of have to add $25/night to your "hotel cost".
I love SOG and have stayed there many times, but for my last big solo trip when I priced things out, with a 30% military discount at POP and the fact that I am in the highest tier for SOG rates, I saved almost $100/day staying at POP - and had the benefits of 180+10 ADRs, 60 day FPPs, free parking, and the "extra" customer service and theming that, quite frankly, are somewhat lacking at SOG.