It would be much easier to navigate spreadsheets within a completed workbook
if there was an option to view the spreadsheet names in a column to the left
of your screen.  (Like the document map feature in Word).  I work with
workbooks for my employer daily that have more tabs than you can view at one
time at the bottom of the screen.  When editing a workbook with this many
tabs, I spend a lot of time scrolling left and right to find the sheets I
need.