Colby, I applied to 4 schools (2 programs at a few of them, and all top schools, no real safeties), and don't regret it at all. Chances are, the 5 schools you applied to are the 5 you want to attend, and any others you may apply to "just in case" won't be players in the end, anyway.
In other news, the waiting is killing me now. I've heard back from BU (waitlist) and Emory (accepted into MSPH GLEPI), but still waiting on Berkeley and HSPH. I'm really happy with Emory, and I would have no qualms attending... but I am anxious to hear back from everywhere else!!! I have strong ties to Boston and would love to get back there (did my undergrad there), and was disappointed by the BU waitlist (though the program was not a good fit for me, so it wasn't unexpected). I just want to knowww!