Over 15 years I have also suffered countless times the nightmare of arriving in Atlanta from an international flight only to have to re check my bags in even though Atlanta is my final destination. Like others I am amazed at how half assed the TSA are and how badly signposted things are as well as a typical lost 30 minutes at least standing inline. I have also winessed the screaming TSA people and total confusion. It gives a terrible impression of the US to international visitors.
IMHO just being able to not go thru this when the new terminal is finished will be a great improvement.
Its also interesting hearing about access via the i75. I normally take MARTA to and from the airport and wonder if they are planning to add another stop?