Well, just did 17 miles in the rain and survived without a massive electrical shock so I guess my concerns were unwarranted. Really no different than riding an ICE bike in the rain (and I've done that more times than I care to count). No problems at all with the bike.
I rode year-round on a 2013 Zero in rainy Seattle for nearly 3 years, so I'm pretty sure it's not going to be a problem. Pressure washing seems to exacerbate risks that rain doesn't. If you're concerned at all after a very wet ride through maybe flooded areas, just let the bike dry off for a while before plugging it in.
You're definitely not going to get shocked. The failure modes are confined to defined safety features taking effect, like the contactor opening or a fuse blowing. It sucks to have a bike that won't go, but it's effective. I did have my bike turn off once because water got under the rubber boot covering an Anderson charge connector once in a very heavy rain, but that was an extra cable that I stupidly left plugged in while riding, not the plug above the motor.