you could attach a resistor to the ground wire, and touch the other electrode of the resistor, with 2 resistors appropriately chosen (so that you don't fry the MM), you can put a multimeter across one of them and observe the discharge, or alternatively build a simple circuit that lights a LED as long as the voltage across the resistor is higher than some value... Discharging doesn't need to hurt..

That said, depending on the setup (type of ground system and electronics) it is not necessarily safe to touch the ground from an outlet!

In my old office, one of the girls got a humidifier to combat the dry air during wintertime. It also seemed to help with the amount of static buildup maybe by making it easier to dissipate. Not a fix by any measure, but it did seem to help a bit. Anyone else tried this?

Yes, a cold water with vibration humidifier. Everything is now covered by a thin layer of white dust from the water. We have medium soft water. A little less chocks I guess but we can't have this white dust everywhere so can't say for sure.

Like an oil diffuser? I think I've read to use distilled water to avoid that problem

We're in a soft water area, so that wasn't a problem! And the type we used heated the water, so most residue would stay within the humidifier.