You can disable them by uninstalling any updates then selecting "disable" from the app management screen.
If you simply say "no, thanks" to having them do any sync they won't use much data (Address Book used 17k of data before I disabled it and hasn't shown up since, Locker has never used any data). Once told not to sync, they also take up little to no CPU or battery.
They take up a little memory, sure, but the phone's got plenty.
Your call either way.