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As mentioned in the design talk, we have a testing extension for the Activities button refresh.
Try it out and let us know what you think!
https://discourse.gnome.org/t/activities-button-call-for-testing/16407
It may not make it clear just by looking on it, but once you click on it or create a new workspace, it becomes a nice visual to help you remember which workspace you're on and which ones you have available.
Pretty much everybody using a window manager already uses one like this.
I know you're making a joke, but you can install the extension today to get the proposed feature. (How to install it is even mentioned when you follow the link.) There's no need for waiting.