Often times, the best way to get responses going on a question like this is to initiate the discussion by providing your own answers
That said, for me :
Favorite poet in their work's entirety would be Walt Whitman, for his view of the world and the thinks he has taken time to give importance.
Favorite Poem - this changes from time to time as my focus of energy changes, but I always end up coming back to E.E. Cummings "Somewhere I have never travelled"