This poem's tone seems quite different than many people's fearful view of death. Dickenson personifies Death as civil and gracious, both of which can be linked with the word "ennoble". Why can't Death be a nice, leisurely ride away from this world. This poem seems to say that one could be carried off in a beautiful way, like in a carriage with a kind guide to accompany her. To me, that description of death is edifying, which means to build up, and it seems very positive. Many people might fear death's violence. This poem, however, seems to give death a different personality that something to be feared.
The main element in many of Dickenson's poems is death. In this particular one, death is also accompanied by eternity and immortality (everlasting) which seem to be contrary to death (the end).