Okay I'm bored right now and there's nothing on TV, so I'll go ahead and spill some details for the nervous MS3's.
I know a lot of people dismiss certain elements of the application (extracurriculars in med school, leadership experience, occupation and activities before med school, Personal Statement, Step 2 CK, etc.). However, after watching my classmates and I all go through this process together over the past 5 months, I'm convinced that these things start to matter when the cohort of 240+ / AOA / Research / Honors in Medicine group gets bigger and bigger. If the rumors from the trail this season are true, then top programs clearly had more qualified applicants than usual this season, and they were probably forced to look at other things on the application.
This year on the interview trail, applicants discussed this stuff a lot (often to the point where it became annoying). I stayed in touch with about 5 or so other applicants I met this season, and we'd swap notes about programs we liked or hated, which places are or aren't interviewing us or our friends, etc.
People give the usual shpiel about "The Big 4". Those that got invites from MGH usually got one from Hopkins too, and vice versa. Brigham and UCSF were once again the ceiling, and those of us that broke that threshold almost always got both MGH/Hopkins as well.
This season also taught us not to underestimate the UPenn / UWash / Michigan / Columbia / Duke cluster. They are extremely picky eaters with pretty unpredictable interview invite patterns. Getting interviews from these places often depended on your medical school's relationship with that particular program, as well as your geography (regional bias, if you're perceived to be "urban" or "small town", etc). If you grew up locally or went to med school locally, you probably got pretty strong consideration from them. If you're applying from 10 states away, it's not impossible, but still an uphill battle. I'd argue that this group is quickly becoming the toughest to please. I'd throw WashU into this category to round out the "Top 10" (whatever the hell that even means anymore), but they seemed to extend far more invites to people probably because they have a very large intern class to fill.
My piece of good news to upcoming IM applicants is that the grass isn't necessarily that much greener at some of these "top" programs, other than a glamorous fellowship Match List. There are plenty of other Top 20/25/30 programs that impressed the pants off of a lot of us, and really do seem to provide everything we are looking for in a strong IM residency program --- plenty challenging with tons of doors open for your career, but with a gut feeling that left you feeling like you would definitely thrive there with those colleagues, that PD, etc. Many of these places seemed more in tune with our personalities, our families, our hobbies, our career goals. And at the end of the day, that's pretty tough to ignore.
I'm sure I'll be told to STFU by some experts or whatever, but I'm just dishing it out. Only 1 guy's opinion here, probably flawed. But I think someone here might be curious to hear someone else's view besides the usual SDN cardiology gamebot "If I don't match at the Big 4, I'm a disgrace to my family" nonsense.