Unbreakable spaces

In the post How to make sure your paper will be rejected Daniel Lemire mentions that the paper will be definitely not accepted if "The authors have obviously never heard of unbreakable spaces." I absolutely agree with such a point, and always use a tilde in LaTeX when typing names, references, etc. However, such a rule is often violated by journals themselves. For instance, today I've got the authors' proofs of our article, accepted for publication in Jounal of Chemical Physics, where all my unbreakable spaces were broken. Afterwards I've had a look to recent articles in Physical Review and some other journals - their publishing staff also seems to be happy with breaking "Fig. 1" into two parts...