I agree on Amon Hem. Fewer effects. Much smaller scale. Both of which allow you to feel more emotion for those involved. Especially Boromir and then Merry and Pippen who watched him get killed. You suddenly see their Shire selves disappear as they witness the death of one of their own. It can be argued that the same happened when they saw Gandalf die. But there's just something more gut wrenching about seeing someone you know shot full of arrows while trying to save your life.