Now that I think about it, if you counter a creature spell it also negates the ETB because the creature doesn’t enter, right?
Yes, you're right. If you [[Essence Scatter]] a creature, it will go straight from the stack to the graveyard without entering the battlefield, so any ETB triggers won't trigger. Now let's say you don't have Essence Scatter but you do have [[Stifle]]. In this case you'll have to let the creature resolve and enter the battlefield, but you can use the Stifle to counter its ETB trigger.