Hoi Ciska,
I think you will find a few Dutch people among the crew, especially officers. There used to be a Dutch captain..Hans Mateboer. All the crew will have nametags which also says which country they come from.
I'm actually a former CM and I happen to be cheesehead too. I will be going back to the Magic in 3 weeks, back in my old role as youth counselor.
Usually there aren't many Dutch guests onboard, maybe a few more cruise on the Wonder than on the Magic because of the expenses.
Hope this helps
Groetjes