Yep. Been there, done that. It definitely takes an adjustment to switch from other cars to a Genesis.
I used to own a Toyota Supra that had a lot of power, but it wasn't in the same league with the Genesis. I've driven my wife's BMW 330xi, but it can't touch the Genesis. My wife used to own a twin-turbo Dodge Stealth; it had a lot of power once you got the turbines spinning at high RPM, but it was sluggish at low RPM coming off a stop. There's nothing like a big V8 to get you moving.
I've always held the position "You can't have too much power in a car". Well, the 4.6 may not be too much power, but it is more than enough for me.
I find it challenging to drive my Genesis below 40 MPH. The throttle is barely cracked. The difference in foot position between 30 MPH and 40 MPH is barely perceptable. That's one of the reasons I use smart cruise control on 40 MPH roads. Heck, even at 75 MPH, it's only turning at 2000 RPM.
It is my opinion that many cars have too much power. Spark ignition engines, where the power is regulated by restricting air flow, are very inefficient at part throttle. These over powered cars contribute to that. The peak power numbers occur at fairly high RPM and wide open throttle.
The times you can run the V8 at wide open throttle are few and far between. In the Genesis that would be from around 25-75mph, foot to the floor. Even then, at 25mph and again after 1-2 shift at 40, the Genesis is down around the 250 hp level.
To me, street engines over 2L should be diesel. Their power curve is flat. Their torque curve peaks where you are actually driving. And because the throttle is always wide open (power is controlled by regulating the amount of fuel) they are much more efficient.
With US cars big V8s became popular because the engines were both very rough at high engines speeds (low manufacturing tolerances) and very inefficient (pushrod valvetrains, primitive carburation and fuel injection systems). Big displacement let them work acceptably at low RPM
Sidebar: Balancing by 1973 Pinto (in 1974) turned a rough 2L to an engine as smooth as any BMW.