They intentionally removed scaling of spells from caster level, now the scaling comes from user higher level spell slots. It makes the strength of caster less exponential and more linear, like the other classes.Not sure if anyone has touched on this yet but it seems like we might be back to "healing is a trap" in 5.0, just like 3.x.
In other words: if your Cure Wounds heals 1d8 +3, that means you're healing 4.5 + 3 = 7.5 on average as a 1st level spell. If monsters can do 8 or more damage on a hit - and many of them do - you're only losing ground when healing. (It gets even worse when there are more monsters that do that much damage at a time at once.) It's better to use your action to kill a monster instead.
The Life domain adds 3 to that spell, and definitely extends its usefulness much further - which is great because that's what that domain is all about. In fact, with this domain even Healing Word can heal for 8.5 on average and it's a bonus action, which is awesome. That's definitely something a cleric would want to do during a turn. It becomes a far better spell than Cure Wounds at low level (and since it has a huge range, it replaces Spare the Dying whenever possible).
Generally though - and I've not seen it in play yet - the math makes me think that healing as an action in combat will usually be a sub-optimal choice. Maybe not as bad as 3.x, but nothing like 4.0, where in-combat healing was a crucial part of the round-to-round mechanics.
Another effect of this is that combats will be quicker in 5e than in 4e. In 4e you really had to "kill" a character 2-3 times over in a single combat for a hope of getting him down due to the healing mechanic. Now the assumption will be that healing in combat is something you only do if desperate.
It's still better for the cleric to heal the fighter so he doesn't go down instead of doing regular melee attacks. Looking at it that way, it isn't a trap to heal. Using a level 1 spell slot to heal in combat when you have access to level 2-3-4 spells isn't smart though (generally).