We use Go for almost everything at JustWatch and that's why we decided to rewrite it in Go as this would allow us to add even more features with better abstraction in the future. Bash just didn't feel like the right fit for that.
You point out (in discussing the design of pass):
> There is one slight drawback to all the simplicity, and that is an information disclosure inherent to the design: pass stores all folder and file names in clear text, so even if you fully trust GPG, you should probably not put this repo into a public place like Github, because this may expose your account names and other metadata.
What's not completely obvious from a cursory read is whether gopass improves upon that. Also, the multiple stores feature looks like it might be quite nice, but a lengthier example would be very helpful!
Edit: improve clarity