Thank you so much for this!
You are welcome!
Some random thoughts......
I am also not a fan of heat in Florida, so the latest that we have gone to WDW is May and the earliest in the fall is September. I generally try to go anywhere from Nov - April, with the focus on Jan and Feb. So, I understand your desire to avoid excess heat.
I do like the fact that the CR allows you to stay inside air-conditioning when going from your tower room to shops, restaurant, monorail, game arcade, etc. It really is nice sometimes to avoid bad weather - be it heat or rain or even cold. this is a big attraction to the CR over the Poly or the GF, IMO. (unless staying in the main building in GF) However, it should be noted that there is a more open feel to the grounds at the back of the CR whereas the Poly does have more foliage along the pathways. Less concrete and more plants makes heat more bearable, IMO. If you want to spend time at the resort on the grounds, that might be something to consider. Similarly, I also find the YC/BC to have long open walkways to Epcot and DHS where the heat feels hotter to me somehow? I'm not sure if I am making any sense here?
Anyway, the convenience of being able to walk back to the CR may not be as great if you want to get out of the heat in a hurry. Although you
can take the monorail and it is only one stop away, plus the monorail platform is inside the CR lobby, so once you are on the monorail you are effectively out of the weather.
OTOH, walking back to the CR can often be done in the length of time (or less) that you could be waiting for transportation.
The Poly has the monorail but also a very nice boat ride to get back to the resort from the MK. the boat is small and open but is a really nice ride. It is a more restful way to return to your resort than walking, but will keep you out in the weather longer.
Obviously pros and cons to both choices.
Bottom line, when I am choosing convenience to the MK as a major factor, then I choose the CR. It is the resort that we chose, for example, as the most convenient to bring our entire family to next year. the reason we chose the CR was convenience for returning to the resort! We will need to return to the resort quickly and often due to severe allergies. This was the resort that we chose.