Script menu has disappeared

Try AppleScript Utility (Applications -> AppleScript folder). The menu bar on/off switch is in this app.

Hi, Trevor and R-C-R!

"I just wish I knew how that option got disabled in the first place... "

(a) Here's a guess:

You can click on any menu extra's icon in the menu bar and (⌘ - drag) it to a diffferent location within the right-hand side of the menu bar, or off the menu bar entirely. (It makes a tiny poof! like Dock animiation.)

Not hard to do inadvertently.

(b) Btw... another way to locate and re-enable a menu extra (e.g., Script Menu.menu) is from its path:

All of the menu extras are located within /System/Library/Core Services/ Menu Extras/. [1]
Double-click an icon to enable the menu extra (script menu, etc.).
You may want to visit this folder simply because some menu extras, like the Eject menu, aren't accessible via System Prefs.
Please note that menu extras are reserved for use by Apple — for good reasons. 3rd-party "menulets" may cause significant system incompatibilities.
HTH!
Regards to you both,
Dean
[1] Path nomenclature is explained here — for any readers who may not be familiar.
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Good tip about the alternate way to re-enable a menu extra!

One very minor correction: the path is "/System/Library/ CoreServices/Menu Extras/" ... No space in "Core Services."

Indeed.

Thanks for clarifying...