It's a multi-tool that allows me to get just enough information about a system to determine if I want to explore it via parallax, without revealing the information I want to discover for myself. If I'm having trouble, I can go back into the FSS for additional hints, or for those outer icy bodies that don't particularly interest me.
I'm not sure if I'm understanding this quite right, but it sounds like you use the FSS to decide whether to explore a system further or not and then manually locate system using an eyechrometer and ignore the rest of the FSS's functionality for the most part (no zoom-in identification). If this is the case, I think I can understand why you would hate the ADS...having all orbits and objects suddenly show up in a system after a honk would destroy the satisfaction of that exploration, where the FSS version will give some reasonable information without spoiling everything.
I guess though my problem with the current FSS is that it is more focused on the type of object in the system rather than the mechanics of the system. The ADS pretty much gave explorers both the object type and mechanics, but the FSS returns just returns the former and a much stripped down version of the latter, which is kind of rubbish for certain exploration types. I would certainly like to see much more of the mechanical information (not just distance and temperature) on bodies that the FSS is pointing at as well as having it integrated into the cockpit (having to slow down to use the FSS isn't fun)...but that would be catering towards my exploration method, and may not help other explorers at all.
Seems a good compromise would be to have the original 3.2 ADS module reinstated (no additional penalties like weight or power).