This is how I have always understood it; coral can switch between carnivorous, photosynthetic, or both. If you have some acro under a big 400w or something, chances are it won't really benefit from supplemental feedings, if you have something lower in a tank, which doesn't get much PAR, it very well may benefit from something like weekly spot feedings of say Rod's coral food. These are the extremes and can be inversely applied at any point in between.
But everything above is correct, its really a personal preference. No one really knows what corals prefer/grow better under. Some people swear by feeding their deepwater corals, because that would be there main source of energy in nature, but who is to say they wouldn't prefer the 1000+ PAR of the sun in the shallows?
The long and short being, if you have adequate lighting, no they will still grow like Mike said, and outstanding even. IMO
, some experimentation is the best part of the hobby. :p