Eh, I think it was okay as it was originally. This was a nice experiment, but I don't think it's suitable.
What it does is draw more attention to the message and make it last longer, while the older system kind of just slapped you in the face once, and you would realize that if you wanted to stop for a moment, you could look in your action bar and read the well-written message. But as it is now, or any variation of what it's doing now, it's just annoying. I walk in the Morninglord Temple that I've been in 500 times before -- What! Ho! A message appears that I've read before (only this time it stays there for several seconds instead of leaving me alone after saying "Hi, I'm a message")!