Step 2 is closer to clinical practice than Step 1. Other than purely as a weed-out #, I still have no idea why most programs (outside of something like pathology) would care about Step 1 above all. That said, they do.
More are realizing that Step 2 is closer to a gauge of your clinical knowledge, so that's becoming more important as well, which is reasonable.
And yes, everyones score goes up on step 2... on average it goes up 15 points. But if your score only went up 10, and your step 2 score is average as opposed to an above average step 1... or (as in my case) your step 2 score goes up 40 points, and goes from below average step 1 to above average step 2, I'd say that's valuable information to have. But maybe that's wishful thinking on my part.