My wife and I sailed the GA in January 2023 on a 12 day out of NYC in the Haven. We went with friends who were Non Haven. We had dinner in the main dining room the first night. The service was terrible, specialty restaurants were fine. Honestly didn't really notice if it was overcrowded or not, sea days we spent between the Haven Courtyard, Sundeck and the Spa.
If you can swing it, book a Haven Cabin.....At least get a Spa Pass