@Velvel - I have not visited Disney Shanghai. But I would image that it is crowded because the population of China.
USA is 330 million people. China is over a billion. So even with a possible market of 100 million people who could possible attend, Disney Shanghai would be crowded.
Disney sells 3, 5, and 7 days vacations.
There are many private Disney Facebook groups and Disney Fan YouTube Channels to talk about your love for Disney and to figure out how to travel and vacation at Disney properties (Disneyland and Disney World) successfully.
Cheers,
Karen