First, the Dream is about 55% bigger than the Wonder - which makes the Wonder about 30% smaller (not 50%). Part of that will be 3 more decks of cabins, which gives no one more public space. It does mean more passengers, Wonder 2400, Dream 4100. (If those numbers are correct in the article i am reading, that is 70% more guests. Hmm.). Bottom line, more people. But still going to the same main 3 restaurants and evening entertainment twice a night.
The area where I feel has the most significant space is the adult entertainment zone. Doesn’t help for the kids.
I found this article from several years ago that compared the Wonder and the Dream. Especially check out the section on the kids’ clubs.
View attachment 697134
This is not a link, just the Google page listing.
Cruising decisions were easier when I started in 2007; there was just the Magic and Wonder. The choice was short 3- or 4-night) v long (7 nights) for cruises out of Port Canaveral. (TA, AK, and PC cruises were not yet pin our sights.)