Interesting,
If they use the grill pan just for kosher fish, then we don't really know if it's always washed separately, or if it's ever washed with sponges from dairy or meat.
Same issue with them making the grill marks and double-wrapped baking, then it wouldn't be 'bishul yisroel' for those who are machmir.
NCL is probably priced well. That's good that they permitted a crock pot in the room. (You asked?)
Wonder if Royal Caribbean would permit a crock pot. Costa allows smoking, so prob more lenient.
Celebrity does not allow smoking, so perhaps they'd be stricter.