This was another opportunistic discovery; I had one set of fingers draped with gooey germination paper and recalcitrant seeds, and just grabbed a nearby pick to try to get them off.
It worked well for that and it was easy to handle, so then it seemed like a good idea to try it with other tiny projects as well.
Arlene, yes, I prefer to get these little ones separated early, too!
It's so much less tedious than trying to separate roots, and it seems that transplant shock is also reduced.
Thanks to all for the thumbs and acorns!