I didn't submit mine until a few days before the deadline - I'm a horrible procrastinator.
I've seen some people suggest that they're slowly weeding applicants out, but who knows. My heart starts racing every time I see someone post another rejection. Then I log in to my application and the status is unchanged, and I don't know whether to feel relieved or disappointed. Of my pending applications, it's the only potential offer I'd take over the one I already have.