I fly fish fresh water but I can still relate to this topic.
I mostly use "sight casting" on rivers & streams; around rocks and logs; ect.
"Blind casting", or pot luck casting as I call it, works well on large bodies of water. I use this tactic for lakes and wide rivers with great success.
"Sight casting" is a lot harder because people tent to set the hook too early in the take, resulting in jerking the fly out of the fish's mouth before the hook enters.
I have lost more fish this way due to an adrenalin rush than to poor fishing tactics.
I like sight casting better, it's more enjoyable to me.
"Somewhere, over the rainbows. I'll cast my fly...."