Advanced driver assistance systems, or ADAS, are anything which are added onto a vehicle in order to assist the driver. The theory is that this will make for safer drivers who are more road aware, so people can be more safe as road users and pedestrians.
In many ways, ADAS are a logical step to take. A parking system, for example, will help you to park your car more effectively, and an automatic parking system may even be able to park the vehicle for you.
However, the thing you must bear in mind is that all systems need to be correctly configured if you are going to be able to use them safely. Make sure you have them serviced regularly, especially if they are very advanced. Something like a headlight system that helps you to see better in the dark might actually be detrimental if it stops working automatically. Regular servicing and configuration is essential if you invest in these kinds of technology.