For non rooted, does selecting the option in application manager to disable apps really do anything? I only notice it makes the icons disappear. Thanks in advance guys. Sorry if this is a dumb question.
Not a dumb question at all. It is actually disabling the APP, meaning it won't launch in the background or at all until you re-enable it. Kind of like freezing them in Titanium Backup for rooted users.
The warning usually says that other things may not work correctly, but you can think about what wouldn't work any more (frequently it won't have any effect at all on other apps or functions) and if for some reason you need it back you can always go back and enable it.