We did one of the first ones out of the UK during covid. We love Disney and our kids are the same. Are you doing a UK one or abroad? I really would love to do one of the Caribbean ones and go their island, it looks fantastic.
The UK one we did was brilliant! The kids club, the rooms, everything. Room service is included so make sure you do that. There are open houses for the kids club areas so adults can have a look (play), the shows are just as good if not better than what you would see in any large main city theatre. The meals are amazing!
When you board you can go on a wait list for your dinner slot to change to the earlier one. I've a feeling evertone gets the late one now and you can change it somehow in your booking if it's available - i've been looking at booking another. Join one of the Disney cruise groups on Facebook.
Many people also get magnets for their stateroom doors - we made some or you can buy them on etsy etc. Some rooms also leave 'fish extenders' outside their doors to exchange gifts with other rooms.
Just to add my youngest has quite a lot of disabilities and they were fantastic with him.
If you're into all the Disney stuff get the ears, matching t-shirts and outfits for you and your kids. If you're not, it doesn't matter, it's not something you have to do and if you don't enjoy it don't worry about it. Some don't do anything and others go full hog.
We got the photopass and made bedt use of it so it was great value for us.
Have the best time, i'm so excited for you.