It is hard for me to understand this.
With 125 cc scoot your speed is just about right for the far right lane: it is comparable to the speed of trucks.
Why was it spooky on FZ1?
I hate riding motorcycles of any kind on the freeway (granted, I haven't tried a Goldwing). The FZ1 is a great bike for all occasions and has more than enough power to deal with freeway traffic, but I still don't like it.
Between the wind blast, noise and the droning on at the same speed, I get frazzled. Add trucks and cars to the mix and it is "spooky".
In the past, when I could afford my FZ1, I would ride on the highway to get to a nice stretch of curving country road.
As for the 150 scooter, I still maintain that riding on the highway is not a good idea. Highway speeds out here are in the 65 - 70 mph range, even in the slow lane, so you won't be "just about right" with your speed and the last thing that I want to be doing on a motorbike is hanging out with trucks in the right lane.
When I am on a motorbike on the freeway, I stay to the right or middle lane if a three lane road. I try not to let myself get stuck between cars or trucks and will quickly accelerate into the left lane and leave the cages in the dust in search of a more lonely piece of highway.
You can't do this if your 150cc scoot is topped out at 55 or 60. Don't get me started about the stability of a scooter vs. a motorcycle at highway speeds.
None of this is to bash scooters since I own one and it is a hoot to drive to work (no freeways thank you). It makes me smile every day.