Luchnia
You will never conquer golf.
I think this part just takes time and practice. I found that I had the same issue, yet the more I played and practiced the more I was able to improve with my full swing. Not always there, but gets better as I work on it.How true regarding the magical tip. But, I wish I can just look at the target and go, on a full swing. It does work on shorter shots where feel is important. My full swing gets worse without swing throughts.
Me and a buddy were playing a round and he was struggling bad with his irons. We got to one hole and I simply told him, "Do me a favor, hit to that brown grassy area just off center about 150 out up on the hill." He hit the ball and he did miss the area some but he was very close and had nice trajectory and range.
I had him repeat this several times and each time he was able to get close. He could not believe what had happened. He took his mind off all the swing stuff he had been told for a few moments and simply hit the ball to the target area. Of course it wasn't long before he was back into the swing "mechanics" stuff of fix this, fix that, do this, do that, and he was whacking strays again.
I think we know a lot of it is different for different people. Obviously some can think of swing mechanics even while they swing. I know another guy that is very analytical and he can tell you exactly what happens during about ever facet of his swing. He might say, "I turned a few degrees inward on my stance." Seems odd, but he knows what he does. I am somewhat like that as well, but my focus is more on target and course strategy as that is how I play my best golf.