Toll the Dead tends to be a much better damage cantrip for clerics at low levels (more damage and WIS save instead of DEX save, which tends to land more against low-level enemies), but it's from Xanathar's, so I expect we won't see it.
Other than that, the cleric cantrip list isn't spectacular for combat, which means clerics may need to be a little more conservative with their spell slots, especially at low levels.
You are correct why waste Clerics spells on some easy fight except perhaps once concentration spell? Do use spells in tough battles.
