Taco which phone are you using? From my understanding the HTC Evo and Incredible(which is what I have) were the main ones, in only ones, that "suffered" after the 2.2 update. I don't think I heard any issues regarding the Motos and Nexus.
I had ATK, but it wasn't set to "Auto-kill" so that wasn't an issue, but the battery would last less than ~12-16hrs with barely any use(after the 2.2 update). Some people found it it was multiple issues(Amazon MP3, network stuff, etc. along with ATK) that was contributing to accelerated battery drainage. Anyway after all of the "mods" I did I can get over 24hrs up time with moderate use; though I also installed a larger battery from the HTC Evo(1300mAh vs. 1500mAh).
If you're not running into battery or memory issues; don't worry about running ATK.