Whitley, I'm with you - I've been on the waitlist for my top-choice PhD program since early March, and have been waiting it out since then. They told me that they only admit two per year, and I've spent a lot of time wondering why those people wouldn't have replied yet. I also wonder if I'm not first on the waitlist (they told me that there were a handful of others), and so others might have been offered a spot before me. In short, I get what you're saying, and it's frustrating to wait and wonder. I'm going to call on April 15 if I don't hear anything by then.
Best of luck to you!