There's not getting around the fact that Regal Princess is huge. Anyone booking a cruise on this ship should certainly expect to see lots of passengers!
That being said, I must say that Princess did a great job in the design of this vessel with respect to traffic flow.
We were on an Eastern Caribbean itinerary. Princess Cays, St. Thomas, and St. Maarten. We had stellar weather and sea conditions, which made everything extra nice.
We were in category D4 - premium deluxe balcony in the aft of the ship. Cabin A-738. The cabin was a standard balcony cabin with a small pull-out couch and a larger than normal balcony. The depth of the balcony was equivalent to those on most other standard cabins, but it stretched a couple of feet to the left (due to some kind of mechanical room next to us), which really made a nice difference.