You'll probably take shit for that one, but some of us will agree with you --- that screencast was excellent. Not sure has-many-through really prompted the "holy shit", though I appreciate it now.
And yes, I'm referring more to the overall feeling... It was one of those things, when I first saw it I couldn't believe it was true. I thought, "if it looks too good to be true, it probably isn't true". So I didn't try it for about 8 months. When I did finally try Rails, it turned out I was wrong. It was true, and it is on a different level than what I was used to before (Java and PHP mostly).