I personally really enjoy this design. This makes much more sense to me than “Activities”.
It can be useful when switching workspaces after minutes of staying on the same one, to know where I am.
My only gripe with it is how scrolling is implemented. It currently isn’t really useful to me, since the target is so small. It’s not worth slowing down for it so I avoid hitting the hot corner, and as a result, I end up just using that and scrolling in the overview.
One potential solution to this would be making the scroll target bigger, as in the entirety of the panel from the left edge to the date. However, that could also be somewhat confusing as there would be no visual indicator as to what you’re scrolling on.