Interesting thoughts.
Toyota UK ran a little competition, the winners of which would get to drive a GT86 up the hill at Goodwood. You had to "Tell us what real driving means to you in 86 characters"
I was trying to capture exactly what you describe, the moments when the car itself fades away, and it's just you and the road. It's a bit like skiing, or mountain biking on a good descent. I was actually remembering nine years ago, driving a normally aspirated Silvia S13 down the touge, chasing a friendly local hashiriya in his R32, which was when I most clearly felt this feeling:
I fly down the road,
reading and tracing its ebb and flow;
the car dissolves around me
Anyway, I didn't win, but this is just a long-winded way of saying that I know what you mean