Thorn Whip is fun in PnP. I've seen it used by a spider-climbing druid on the ceiling to pull targets straight up then drop them for falling damage.
I see the "Spell Sniper" feat is due to be added to the game. This, if implemented as per PnP, should double the range to 60 ft. (it shouldn't matter that it's a melee spell attack roll). And it gives you and extra attack cantrip from any class.
