I believe it is much easier and faster to walk to the TTC from ANY building at the Poly than to transfer monorails at the TTC (even the furthest from the TTC, Tuvalu or Aotearoa), especially when going TO Epcot.
To do the transfer option, you have to walk to the GCH, wait for the elevator (if you have a stroller), wait for the resort monorail, stop at GF, MK, CR then TTC, walk down one ramp, walk up the other ramp (you don't just step across the platform) and then wait for the Epcot monorail.
Instead, you could simply walk to the TTC (2-12 minutes on average, depending on your longhouse) and take the direct Epcot monorail. It is also easier in many cases to take direct buses from the TTC to DHS and AK, rather than the Poly buses, which often stop at the other monorail resorts.
Samoa is nice and centrally located, and so are Niue, Rarotonga and Tokelau, but honestly, it is a compact resort, and nothing is very far from anything IMO. The real trick, if you are aiming to save time and minimize steps, is finding the most direct route from one point to the other. Study the map before you leave, orient yourself on the day you arrive, wander the beautiful grounds. You'll be surprised how easy it really is to get around. You can even cut through buildings (except Hawaii) to stay dry(ish) on rainy days.