Problem: with a lot of sheets, it can sometimes be daunting to quickly find the on you're looking for.
Proposed solution: what if SS used something like Google's "star" feature?
Here's a quick mock-up just to get the juices flowing (potentially).
So an extension of the "Favorites"? Yea, that'll be useful. Just a minor suggestion, instead of having the Star within the sheet, maybe just have it as an image in the Tab of the sheet?
I created a directory of my sheets. The primary column is the name of the sheet which I have hyperlinked to the actual sheet. The second column is the location of the sheet (ie what workspce or folder it is in). The third column is a brief disciption of the sheet.
I have created exactly the same type of sheet index as Stephanie, but also added a "screenshot image" of the actual sheet to the row.
Our users often find a visual browse of sheets to be much quicker in finding what they are after rather than scrolling through text.
But I also think the start toggle would be a great feature.