Disneyland is always busy
If I go on Monday (eg 2 weeks ago), I need to queue for 20 to 30 min to get on the Winnie the Pooh ride. If I go on Sunday (eg. last Sunday) we only queue for 5 min.
However, CNY might be different so I am not sure when is the best time to go. If I am you, I will go when it is the best time for me and my family
These are some of my "tips" that I would like to share with you:
Try to get there early, like, 9.45am.
Buy the tickets at Central MTR station (it's faster than queueing up at the Gate)
Go straight to get fast pass.
Go on early shows
Have lunch/dinner earlier
Use busy lunch/dinner hour to go on rides
Some rides are quite nice in the evening like the Carousel, River cruise, Dumbo, etc and less time for queueing up.
It is faster for single rider to go on Space Mountain (less than one min wait)
It's faster to walk from Disneyland Hotel to the Park (if you don't have much to carry) and it is a quiet and beautiful walk and puschair friendly. If you take shuttle bus, you still have to walk from the bus station to the Park with lots of people and smoking people!
Buffet at the Disneyland hotel is very very children friendly. The first time we took our daughter there was when she was 15 months old and she loved it very much! Disney characters will be there at breakfasts, dinner buffets or lunch on weekends.
Dim Sum at the Disneyland Hotel is the best dim sum I ever had and the service is fantastic! However, it is not cheap either. E.g. 3 adults with the usual hakau, siumai, charsiupao, siulongpao, taro puff and another dish costed about HKD 500.
I wish you will have a magical day at HK Disneyland...hahaha...