Great song. It's really hard for me to rank the songs from SfaM, since it's such a strong album, but I love it. Also, much like Finally Free, it's one of the foremost songs I use to argue against the "emotionless" charge so often leveled against Dream Theater. It's really popular to say they're basically just dicking around on instruments, not imbuing their music with actual emotion. But I'm not a musician at all, I rarely understand what Dream Theater's doing, and it's songs like Home that make me love their material--in part because of the level of emotion.
Not only is it a pivotal moment in the story, but LaBrie's delivery, along with the instrumentation, makes it extremely emotional. I love it.
I heard the "porn" section on a second or third listen, I think. When I told my girlfriend about it she was pretty surprised, because she had been listening to the song too and I don't think she noticed it either. I do think it weakens the song, just because there are several people for whom I haven't even played SfaM because of it.