bherronp, just remember that's ONE person's experience of getting into Harvard and other top schools. Just like each top-school's class profile, EVERYONE is different and will come from very different backgrounds and levels of preparation.
I've talked with Stanford admits who started his essays and took his GMAT 3-4 weeks before the R1 deadline, and Stanford "dings" who prepared months and years in advance. Some people have the raw talent and ability, others compensate by hard work. Some know their career goals from undergrad, others fall into the b-school track later on in life. All of these people will be represented in the diverse class of a top school, so you need not worry too much about how much preparation you did or how early you started.
Granted, everything else the guy said is pretty true about what they look for, but not everyone will be on the board of a non-profit organization from the get go, just like not everyone would have hiked Mt. Everest or got an Olympic gold medal in track and field.
Just do your best, present YOUR story in the best light possible, be yourself, and let the pieces fall together however they do.