At the bottom of the screen is a row of worksheets. However when you get to Workbooks that contain say 20 or 30 or 50 worksheets, it becomes a true disaster to navigate around that many sheets. What would be very helpful would be if you could expand to two rows at the bottom. That in itself would be helpful. But the really neat thing would be is if you could nest-sheets within like a high level. So perhaps like a folder with sheets inside of it. So you have one row that is all the folders and then inside the sheets on the second row.
As an example, what I attached, as a rough cheesy example, shows that you are in Folder 1 (selected), and folder 1 has 8 sheets. I would still require every sheet name within the document to be unique and ergo you don't change any of the other backend coding or VB if you want to reference a sheet name. All you are doing is changing the presentation of the sheets, not impacting any underlying coding about the individual uniqueness of the sheets.
Just a thought. Working in excels with anything over 30 or 40 sheets becomes a real problem navigating.