Funny enough, someone was able to find my real name and address. (They sent me a package!).
They just visited the web site which I also linked to my real domain, which they found my resume... but that is an exception to the rule since I knew it's possible, just not how determined that certain someone was.
Think of it this way - if they can trace an IP to a real name easily, the RIAA won't be filing lawsuits based on IP addresses now, would they? They wouldn't need to go to the ISP to get that information. And a Comcast customer wouldn't be suing Comcast for Comcast giving their information to the RIAA. It's not easy, and it involves a lot of court time for whoever wants to find out who's at the other end of an IP address.
Plus, some IPs are highly dynamic, so even knowing the IP today doesn't mean it's the same possibly an hour from now. Port scanning and network mapping is far easier and gets you a bunch of IPs that are valid in minutes, rather than hours-old forum posts. (plus, visiting a forum requires work. port scanning and IP scanning takes seconds and is hands-off. Lazy wins.).