NCL is doing 7 and 9 night one way baltic cruises from Copenhagen to Helsinki that have port stops in Estonia, Latvia, Lithuania, Gydnia, Stockholm, Oslo, 2 in Germany. One sea day on the 9 night and none on the 7. It's an older ship, but the cruises are about sold out this year. I booked one for next year.
I'm not sure why
DCL can't put the Magic or Wonder in Europe with some better itineraries. It think they would sell. It doesn't seem like Disney wants to keep their customer base as they age and want to travel to different places. It's all about short cruises and first time cruisers.