You are not the only one. I too have Aperture but after many problems with the software over 18 months of use, I decided to simply not use it.
Photographs are priceless and I have lost all confidence in Aperture.
Of course I needed to find an alternative. I am a Canon user so all was not lost as their Digital Photo Professional software is free.
I was so familiar with Aperture that it took quite a bit of mental effort to learn DPP and found that as a Canon user it is actually better than Aperture.
For one it's more stable. It's also faster. It's tailored to Canon cameras. There is no library to archive. The changes to raw files are saved within the raw file metadata. In other words the raw file houses the original and any changes made. After 6 months of use, it has not caused me to have any loss of confidence the way Aperture did. An excellent description of DPP and it's use and ability is athttp://the-digital-picture.com/Photography-Tips/Digital-Workflow.aspx