"One of the things that amazes me is how it was planned and put together so that everything and everyone was in the right place at the right time2
In a general sense...exactly right.
After that "everyone at the right place at the right time" depends upon what you define as the right place and at the right time.
The Airborne Drops surely did not meet that standard.
Some of the beach landings were at the wrong place which allowed for fewer casualties.
Then there is the matter of the sixth beach.
The other factoid that should be considered....there were more casualties at Omaha Beach than all of the other four Beaches combined....Gold, Juno, Sword, and Utah.
The American 1st and 29th Divisions took approximately 24,000 wounded and killed getting across the beach and onto high ground.
The great planning somehow overlooked what kind of terrain lay behind the beaches in Normandy and did not appreciate the effect the Hedgerows would provide the defenders.
No matter how one looks at it....it was an amazing feat of arms....done on the courage and dedication of the Troops involved in the. actual combat but achieved because the excellent logistics system that was on place leading up to and during the beach assault and the rest of the War.