Things I've done with Dancing Lights in table top include:
Faking the appearance of an incorpeal undead creature.
Lure a patrol of enemies off a cliff to pursue the "torchlights" they had caught sight of in the middle of the night.
Spread throughout a room to create several points of bright bright light.
Send signals.
Startle an enemy by putting one in their face to interfere with their next attack.
provide a path for an ally to follow.
support a bardic performance
A few other things here and there.
But yeah, I expected it wouldn't have as much functionality as it did in the tabletop, I'll have to consider the fact Darkvision just reduces things to Dim rather than normal vision.
1. and 2. are clever, 3 and 5 should not work in the rules (it's dim light, and if disadvantage were that easy to impose everyone would do it), and 4 6 and 7 are on the scale with what I think could be easily added to the game in minor interactions.
1 and 2 could be written in as novel solutions to a problem, or rather a similar use-in general I'd like to see more cantrip solutions to problems. That's the real use of them, not as surface creating super-damage dealers.
