There seems to be one place that still requires step 2 pass to rank. If you're seriously considering that program after interviews, I'd just worry about taking step 2 at that point.
I took step 2 early and crushed it, and I don't think it mattered one bit. The issue is that step 2 is easier to get a high score on than step 1 in a lot of ways, so everyone expects you to improve. Most applicants with step 2 scores have high scores. Having a low step 2 score or lower than your step 1 score would stand out. So in my opinion, step 2 probably won't help you unless you're trying to compensate for a low step 1 score. It's debatable in its use to compensate for a low step 1, but it's still a good idea to try if you're in that camp. Otherwise, step 2 can pretty much only hurt you.
Your mileage may vary. This is just one guy's experience/opinion. It's not like all the programs (or even all the adcoms at one program) get together and come to a consensus opinion on these things.