This is correct, you do not need tickets. IMO, watching it accross the water in Titisville is better then then watching it from the KSC Visitors Center. Granted, if you could get causeway tickets, those would technically be better then in Titusville cause you dont have to worry about driving over earlier and findind a good spot but those can get really expensive and then if the launch get scrubbed again, you could be out your money spent (sometimes you can use them for a future launch but I think that only applies if the launch is scrubbed in advance, I think if you actually ride the bus out to the causeway, they are considered used).
Look on Craigslist. I saw a lit listed right after the launch was scrubbed in December - not sure whats still listed.
I have seen launches from both titusville and on the causeway - both were spectacular!