so for me, I applied in 2008 between my jr and sr years - didn't know what i was doing, applied SUPER late (like, in october at the deadline..all bad) - no luck
reapplied in 2009 with a couple more classes, much of the same experience, but applied earlier - no luck again.
By this point it was early 2010 and I knew I didn't make it--it was at this point that I decided to take a step back. I decided to not reapply that year, nor would I apply by taking a gap year. I gave myself at least 2 years to figure out if medicine was still what I wanted, try out activities and EC's that I didn't do in college--and just overall revamp myself and see where that would take me. So I actually took 2 years off--and it really helped me take my time and find things that were enriching and also helped me self-discover my motivations and desires for pursuing medicine.
What I'm saying is--don't rush into it and reapply. A gap year is good! and for some, two years may be even better. For me, if this was something I wanted to do for the rest of my life, a delay of 2 years (3 including the app year) is a worthwhile investment