I like it because it's brain-dead easy. I got more tired doing other whole areas over and over than I did farming the train. Plus, with doing the dailies, crafting and just generally taking my time, I don't get burnt out so easily. If I get tired of it, I just do this revolutionary thing called 'stopping'.
And I just open all the champ bags on the chars that get them, gives me gear upgrades appropriate for them and mats going up tier by tier to boost my crafting with.