In reply to Matt.

My only gripe with it currently is that the +insert menu has a lot of blocks. It's a fairly straightforward principle that direct access (asking you to interpret a symbol or text) performs better than sequential access (asking you to remember) in cognitive science.

https://www.nngroup.com/articles/direct-vs-sequential-access/

I think a heavier weight text at the top of the nav bar might help people distinguish visual / text editor versions and moving the insert menu to the right or heavier text would help see how many blocks there really are (like you do in the widgets menu now).

Or use bullet points for the blocks inside the insert menu: (common, formatting, layout, widgets) that reveal their choices.