Disabling all Facebook apps can be a great way to increase security of your account provided you are not a frequent user of Facebook apps.
Here is how to disable them :
1. Once logged in to Facebook, click on Account > Privacy Settings.
2. Select Edit Your Settings under the Apps and Websites section.
3. Click on Turn off link for all platform apps.
Doing this will restrict the Facebook functionality to a great extent but in turn also reduces vulnerabilities especially when rogue apps play havoc with your Facebook account (like spamming everyone on your list etc.)
Cheers.