Daniel,
A few months ago I slept on a lot of different surfaces and I found it all depends on your environment. On rocks and ice, i.e. Glacier, you need some type of pad. Other than that pretty much anywhere you go you don't
NEED to take a pad unless you want something really quick. In my estimate they usually take up a lot of room when something natural would be readily available, especially in Oregon, at least that would be my guess with all the different Pines around. I Yeah it does take more time and effort than a polypad or some type of matress but I prefer the natural stuff most of the time. I don't like Thermarest because they seem to puncture easy, maybe its just when we practice evasion that it tends to occur. On normal trips I would guess it to be fine in a tent.
Also like you mentioned, carve out the area for your back if alone. In the Alpine section of AK, we slept on an area with peat on top of rocks and it was not comfortable due to my body not fitting in the tight space. I woke up very uncomfortably a few times due to not having enough piled up. It was not due to unavailability, merely due to laziness cause I was soaking wet and miserable. :grumpy:
"If it ain't rainin', it ain't trainin!!!"
I hope my two cents helped. When you can go natural, pine needles are very comfortable and if you have Pinion or Ponderosas around you can gather a great insulation bed in no time at all. Ahhh, good times
Take care and God bless,
Jamie
PS. Is your wife's maiden name Kincaid?