We just completed the trans pacific From Sydney to SF last month. We were on the Grand and it was only about 3/4 full. We prefer the smaller ships. The Grand works for us. We had cabin A734 which is steps away from the door the leads to the Terrace Pool. Loved it have booked again for next year.
The wheelhouse bar has good music and many people liked to dance there. We enjoyed watching. Don't care for Piazza.