I feel the same way, especially as an emacs user. Org-babel seems to be a superior implementation of the same idea. Org is just a text document, so git and git diffs work. I can use any combination of languages I want in a document and have them running in different sessions. And best of all I can edit code blocks using my customized major mode for that language. On top of that you get all the goodness that comes with org-mode, not least of which is the ability export it to dozens of other human readable formats for easy sharing. I think there's even an exporter for jupyter notebooks (there's at least one for ipython notebooks).