I apologise in advance for the pun in the title and I am a horrible, horrible person for using it.
When I first got FFX, I remember really liking the idea of being able to control your summons and not have them disappear after one attack. I liked the idea of being able to control Ifrit and Shiva and have them do my bidding. The novelty, however, quickly wore off and after a couple of hours I never used them outside of boss battles. Even then it was only if the boss were weak to a certain element, I was in a particular bind or when Yuna had an overdrive that I actually called on them to help. Admittedly they're quite useful cannon fodder too. I just found little incentive to really power them up or use them.
So, FFX forum, did you ever really use your aeons much?