Hi Salty,
I am not sure what the width of the river is at Holland America Kade, nor if the scaling is correct in SSE. But "Oceana" is said to be 397m long against "Harmony of the Seas" at 362m. So could it be that such a ship could turn as in my picture? Gently easing off the quay, using all her 4 fancy thrusters and 3 main azipod drives to come gently astern and then easing her stern into the entrance to the Rijnhaven astern of her. I feel sure also that a giant like that would have tugs in attendance too. If the depths are dredged OK it looks as if this could be done right there. However, like you, I would very much like to know if it is done here or elsewhere.
Angus