Perhaps the solution to the workflow problem would not be the journal file view, but programs more oriented to workflow.
Instead of doing "Save Image As" and then opening GIMP, what the user really wants to do is "save the image on my computer and open it with GIMP." Might it not be better to have this as an option in the web browser? And then of course GIMP could have "save the image on my computer and email it to..."
I do like the idea of increased task orientation, though.