Hi, Kasia!
Hmmm....I've never heard that. As a citizen of any country, you can book a Disney Cruise Line vacation on
DisneyCruise.com. The only difference may be in producing your travel documentation which is required at the time of booking. You'll simply provide your personal information including your address, country, contact information, birthdays and passport numbers.
In addition to a valid passport, many countries which you may visit require an entry visa based on your nationality. It is each guest's responsibility to identify and obtain all the necessary visas before commencing the cruise. Because requirements may vary, guests are advised to contact their local consulate or embassy for more information on required travel documentation for the port of embarkation and all ports of call during the cruise.
If your country participates in the Visa Waiver Program, you are now required to have a valid machine-readable passport and obtain 72-hour advance travel authorization via the Electronic System for Travel Authorization (ESTA) prior to boarding carriers by air or sea to the U.S. under the visa waiver program. For a list of applicable countries and registration requirements, ESTA information is accessible online at http://cbp.gov/travel.
I hope this helps you plan, and maybe the information was given to you because it may be easier to obtain travel information from a travel agent rather than trying to figure out how to plan things on your own.Yet, it never hurts to confirm any information you're given -- I'm glad I could help point you in the right direction.
Let me know if you think of other questions. Have a wonderful day and a magical vacation.
Bon voyage!
Andi