I don't have an iPhone, but as a programmer, I can tell you that there is plenty of information that is useful to developers and engineers as they try to locate and replicate problems that you have been having. This doesn't have anything to do with your personal information, it's more to do with where the program was in the flow of execution when it crashed, and what portions of the program caused the flaw.
As a programmer, I really don't want to know what your personal stuff says when I'm trying to fix a problem. I just want to know where to look to find the problem.