In the paper "Do Developers Understand IEEE Floating Point" the authors surveys phd student and faculty members from computer science and found out that your observation is true: most people don't know how fp works.
They have the survey online at [1] in case you want to see how much you know about fp behavior.
They have the survey online at [1] in case you want to see how much you know about fp behavior.
[1] http://presciencelab.org/float