[maljx]

Go to /Library/LaunchDaemons/ and delete what you don't want to run at launch. (At your own risk of course.)

[x0x0]

Better to run "launchctl list | grep -iv com\.apple" for both yourself and root; there are multiple places that startup items can be placed.

[lobster_johnson]

Don't delete. Instead, run "launchctl unload -w <file name>". This will stop the service and disable it from loading on boot.

[fivesigma]

Tried that, didn't work. My guess is that Photoshop ran some kind of script that re-enabled it. I went to great lengths trying to gracefully disable all the CC crap before I gave up and rm -rf'd every damn file/directory containing adobe.