I find the Ctrl+ PgDn/PgUpnot good enough. When I have a lot of tabs it's very annoying to get to the right tab, or move it and change the order, which is sometimes important.
I need Excel to switch between the current tab and the previous tab I worked with - regardless of their physical order. Just like windows Alt + Tab .
I guess I can build a macro that remembers my last tab and assign a shortcut to it, but I would like to know if Excel already comes with that functionality.