DH and I did the Western TA back in 2017 and absolutely LOVED it! The only downfall for us was that due to hurricane Maria coming up the eastern seaboard, our port of call into St. John's, Newfoundland was cancelled as we would've been sailing into NY right as the storm was scheduled to hit. So we ended up with 6 nights at sea (a few rough days due to some storms). It was definitely a port I was looking forward to seeing. DCL did make up the missed port by staying in NY overnight so the ship was basically our hotel. They did arrange some last minute excursions (which we didn't do--we decided to tour the city on our own).
We sailed in Sept. and definitely had nice enough weather to layout and "sun" ourselves in swimsuits. I never got tired of the sea days, personally, as I love to read/nap up on deck or even just watch the funnel vision movies. There were interesting guest speakers onboard and things heard more for adults on this cruise (I think they said there were less than 100 kids onboard). That being said, we were NOT prepared for how busy the adults' only section would be--definitely NOT a relaxing spot! You had to fight for the nice padded lounge chairs, people left towels on them so you never knew if someone was actually using it or if they left their used towels there for the cast member to "clear away."
Biggest highlight for us was sailing into NY harbor in the morning and having a view of the Statue of Liberty from our verandah! We did go up on deck for some hot chocolate and to get some NY skyline pictures but it was too windy to stay up there for long. So glad we booked a port-side room!
I would definitely love to do the Eastern crossing sometime or the Panama Canal for the same reasons: good price, long cruise, less kids on board, and romantic time spent with loved one!