Since we didn't have a WRUP this weekend, I'll go ahead and tell you what I did: leveled alts using Alterac Valley. Just a few hours of play, and the levels were flying past without a care, even with only about a 50% win rate. And those times we won fast? Hoo Boy. 100-150k experience for about 10 minutes of work is nothing to sneeze at.
It might be possible that I could have leveled up quicker by loading up a few questing addons and buckling down, but I found PvPing a lot more fun and relaxing for some reason, and I don't think questing would have been all that much quicker.