I've never driven that route, but my perspective on mountain driving comes from my experiences in Colorado.
I literally almost get motion sickness, no matter where I used to drive in CO. I remember driving to Estes Park at night, alone, and I didn't think I was going to make it!
Now, driving on I-90 through Montana on a clear, cold winter night is fantastic :-)
"I remember driving to Estes Park at night, alone, and I didn't think I was going to make it!"
Drove that stretch and back one night a couple of weeks ago on my bike. What a rush! Not much room for mistakes though. I found it kind of difficult to lay a 1500 Kawasaki Mean Streak down on some of the curves, the foot pegs tend to scrape (guess that's why they're hinged). The greatest danger is the morons in their SUVS that think they are invulnerable.