This was comforting, because I know that even if I don't use much of what I've written, it all serves the overall story. I got a better understanding of some new characters, and found ways to increase tension in the plot. Ultimately, I'm changing things because I think it will make for a better novel, which makes the effort worth it.
So, I'm busy with draft 2, even if half of it will really be a first draft. Wish me luck!