I'm currently finishing my PhD in Biology here at UCSD. This was a big change from physics and I am not directly doing much physics related research. However, I think my physics training was very important. I learned how to be a clear, critical, scientific thinker which has served me well here. Having a physics background in no way hindered my applications to biology graduate schools. I think most schools considered it an advantage. The field of biology is becoming much more analytical and the perspective I have with a physics background is quite useful. Now that I am looking for a job, I think having a background in both physics and biology will help a lot.

Physics majors can certainly go on to do all kinds of strange things, even public policy and international affairs:

https://elliott.gwu.edu/pace

Physics training has been an invaluable aid throughout my career despite my grade in quantum mechanics. : >

Regarding the employment opportunities for physicists; I've found that physics offers a great deal of flexibility in choosing a career path. When I decided to return to the west coast and join IBM, I was also actively recruited by a teaching college, research university, national lab and I had a tenured position at Argonne if I had chosen to stay there. Presently, the job market is very strong for Ph.D.s.

I've felt for quite some time that an HMC physics major can do anything he or she wants. The mere fact of making it through the program attests to a certain amount of natural ability, but at least as important is the fact that much of what we learn is many methods of approaching problems. The flexibility and open-mindedness which results is of great value in (I believe) any career option, from physics to software engineering to investment banking. So, though physics doesn't apply directly to writing software, the training I got has helped indirectly in a great many ways, most of which I don't realize until I stop and think about it for a bit.