Back when I was trying to figure out how I would handle cleric spells in my campaign I made a chart of how first level cleric spells changed through the editions to help myself see what was going on. Delta has been posting some interesting stuff about how spells have changed through the editions so I dug out my chart, prettied it up, and offer it to you.
I ignored the druid spells that got pulled in during 2e, not because I don't approve of them functioning as generic priest spells, but to keep things clearer; druid had always been a separate archetype and so I keep those spells separate. There are probably errors.
The main thing I notice is the accretion over time of more spells. That makes sense. Wizard spells are more dramatic in that regard, going from 8 1st level spells to 45 by 2e.