When I removed the latch (pictured) two weeks ago, I cleaned up the old grime / grease around all moving parts, hit it with electrical cleaner and then compressed air for a good 4-5 minutes, and re-greased the latch, cables, etc.

Yesterday I finally decided to plug the fuse back in (before taking the door apart again) just to see if the problem remained, or if the symptoms were any different from a month ago. Interestingly, the interior lights worked exactly as they should (as outlined in the service manual), with no issues at all. When I checked it this morning, all was still well.

From this I am concluding that a) the culprit was in fact the driver's side door latch (since I didn't touch any other door), and b) I may have somehow removed debris from around the hall sensors that was effecting the voltage. Possibly?

Anyway, I warned my wife that the problem could return, so she should keep an eye on it, but for now it appears to work.

What do you guys think?

Cleaning it could have helped, but unplugging and plugging it back in may have cleaned up the contacts in the harness as well.

If it is working, I would do exactly as you outline, leave it and make a mental note to all drivers to see if it happens again.

Will do - thanks Jeff!