If you ever decided to take the time to sit and sift through the hundreds and thousands of packages that live within the default repositories in Cydia, I would imagine you would need to set aside a fair portion of your week in order to get through them all. With that said, even if you managed to sort through the packages, you only come out with a handful of tweaks or extensions that would be classed as essential installations for your jailbroken iOS device.
One of the handy things about jailbreaking is that some of the great ideas featured on other smartphone devices can be ported over to iOS, such as Android's connect-the-dots unlocking mechanism, which found a way to iDevices through the AndroidLock tweak.
