I run into this problem all the time--not good for diminishing by reload-addiction! It would be nice if pages included some js to rewrite history[1] via dom, so that we could always see the freshest versions of pages.
[1] It pains me to advocate breaking the "show me exactly what I was just seeing" semantics of the back button, but I think in this case the user clearly conceives the back button as "show me the abstract resource I was just seeing."