We've sold many many cruisers for people on their honeymoon and it's an awesome way to celebrate the beginning of your life together. And yes, it's always a good idea to mention it's your honeymoon. In fact, I highly suggest you have your agent make of note of it in your booking!
The Enchantment of the Seas is an older ship, but many years ago they cut it in half, pulled it apart, stuck in a new 75' section, and then glued the whole thing back together. The balcony cabins in the new section are a bit nicer than those in the older section.
Quite frankly, there are better and nicer ships because the cabins on this one are a bit smaller than on the newer ships. It is one of the older Vision-class ships, of which we spent more than 50 nights on. Because of the smaller size, they have less amenities than the Radiance-class ships, which are some of our all-time favorite RCCL ships.
But you'll have a wonderful time because you're together and nothing else matters.