Riding on grooved or milled pavement?

[meowguy_imp]

So I had my first experience on grooved (milled) pavement and I absolutely did not like it. I found I could maybe handle 35 or 40 mph, but anything more was just too uncomfortable. Then later that day it started raining and I followed a Harley (from my truck) that was clocking 50 mph on wet grooved pavement.

So what's the deal. Am I chicken or was the Harley pilot crazy?