this is the experience i had last year... applied mainly to northeast (ma, ny, pa, dc) programs
i didn't get a great score on step I, probably around national average. took step 2 in december. didn't release it to any programs. actually probably interviewed at 5 or so before i even took it. only went to a handful after i got my score back. only one for my score on step 2 and i just told them that i hadn't gotten them back. so basically i would say if you have a high step 1 score, you don't need step 2.
to give you an idea i'll list a portion of places i interviewed at -- in no particular order -- bu, suny-downstate, jacobi, temple, mcp, penn, christiana.