One of the moments in Titanic that really does it for me is seeing Thomas Andrews standing in the lounge at the fireplace mantle as Titanic goes down. He was so proud of his creation and chose to die with her.
Indeed. I love when he adjusts the clock on the mantle. That "Nearer My God to Thee" sequence is a beautiful made one. From the Strouds cuddling in there bed, the 3rd Class woman reading a bedtime story to her children, water swelling in parts of the ship, the chaos on the deck. Beautiful scene.
The Jack and Rose stuff is schmaltzy and too much sometimes, but once the ship hits the iceberg not only have the human characters been established but the ship as a character herself has been. As we've seen her rooms and suites and the glamour and ritz she was and it's as big a tragedy to see the SHIP die as it is to see the human characters (and "red shirts") to go down too. Once the ship hits the iceberg Titanic goes from being a good and tolerable love story-movie to being one hell of tense action movie about one tragic and helish night that is very well done and no Titanic sinking has ever been so perfectly, accurately and realisticly performed. (Granted, the accuracy is more to do with the knowledge we gained fromt he wreck since the earlier movies done on the sinking.)
Titanic is worth watching for the second half alone.