Crowds and Anxiety

Hi, 5x time cruiser and I’ve been on some decent sized cruises 2500-3000 passengers. But I am really interested in some of the oasis class ships but seen that there at quite a lot of people on board (5000+) for those who have sailed on RCL large ships does it feel like a lot of people? Is there room to enjoy parts of the ship without it feeling overwhelming?

Just wanted to get some opinions as I book for 2026!