Having played with it for a bit, I find that to be the case! Thanks!
I came up with that question in my search to a way of filing a document directly to a specific folder.
Although this is taking us away from the specific question ('Where is Go on the menu bar?'), now answered, I haven't figured out how to save a document with the Go function.
In case anybody else has been steered here from that post (How to save a File to specific *Folder*, https://discussions.apple.com/thread/5900533?answerId=24863668022#24863668022), I believe that I have found that it can be done, after all, through 'File'>'Save as' (in OS Sierra). However, I haven't been able to repeat this consistently: With 'Save as' there appear to be two different menus, a simple one with 'Save as:', 'Tags', 'Where:' and 'Format:'. 'Where:' has a drop-down menu with a number of folders to choose from but doesn't lead to 'All files'. However, sometimes a different, page-filling, menu appears that branches out to all stored folders (in alphabetical sequence!). Unfortunately, I don't know yet how to call up this particular menu consistently, in stead of the simple one. It has appeared frequently, but I don't know why.
Because I had never before gone to the bottom of this latter menu, I hadn't realised that this is how to file directly to a specific folder.
Once I have played with this some more and formulated this question more clearly, I'll return to the earlier post (How to Save a File to specific *folder*).