I've been slowly rewatching S2. I just finished Houses of the Holy. This is one that I haven't watched to death. I liked it originally, but it wasn't one of those OMG! WOW! episodes for me at the time.
Didn't Kripke once say in an interview that SPN would not be dealing with angels at all? I can't remember if he said that before or after this episode--but I thought it was before the episode. At the time I watched this I thought this was Kripke's way of putting the whole angel possibilities to bed.
But my brain just wants to fill in speculation.