Major, it took me about 10 minutes this last time to wet the grain, I only brew 5 gallon batches. Spray, stir, and repeat. Then I let it sit about 5 minutes before milling. I could see it being difficult with larger grists, and more work. You'd almost have to weigh out the grain in several smaller more manageable batches to use the same technique.
Babalu, that's an interesting technique about letting it sit overnight, I only let it sit as long as it takes me to hand mill the grain, plus maybe 5 minutes. Do the husks still feel sorta sticky the next day, or does the grain absorb all the surface moisture?
As for lacto, I haven't let it sit overnight yet. If Babalu isn't tasting any sourness then it may not be an issue.