It's definitely still worth it. WEP will stop the majority of people from getting on your network. Seriously, most people aren't hackers, they just see a network and connect to it.
You also don't protect yourself against the wast majority of people. You protect yourself against the few people that want to gain illegal access. WEP will not stop them.
You also don't need to be a "hacker" to break in. In five mins you can download GUI-software to do it. Push a button, and you are in.