Change active worksheet with Left hand only
Currently Excel's shortcut for changing worksheets is Ctrl + PgUp / PgDn which works fine but requires taking the right hand off the mouse OR moving the left hand across the keyboard to an awkward position.
It would be nice if Ctrl + Tab / Ctrl + Shift + Tab had the same functionality like in a web browser.
Thomas K commented
Ctrl + tab is already a shortcut in office.
It changes documents/files.