I also agree that the Oasis and the Allure do not feel crowded. They are not like malls at all.
They have many venues and people are not all hanging around the same place.
The freedom class ships are quite nice and I enjoyed my two cruises on the Liberty.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!