Since 2.3 was released I've taken more interest in some of my lower level alts that have been mostly shelved lately. To summarize how well the new leveling changes work, here's a timeline.
Date: 11/13/2007Bliz Releases WoW 2.3
/dohappydance
After patch applied login to 1K+ latency
/dounhappydance
Read support forums and find out I'm not alone
/dohopefuldance
Fail to correct problem after every imaginable change
/dopissedoffdance
Date: 11/17/2007Figured out -nosound is now needed for my client to have < 1K+ latency
/dopartiallysatisfieddance
Start leveling the Shaman on a limited basis. He's currently 33.
End of day Sunday, 11/18/2007 he is 37 with still some rest bonus remaining and limited questing. Very nice...
Date: 11/21/2007Thanksgiving holiday starts with more play time. Let the leveling begin. I hit 39 with no effort but rest bonus is gone.
All night conference call (I'm on-call) limits play and I become nastily sick so almost no play on 11/22 and 11/23.
Date: 11/25/2007Start working on the shaman again with some effort. I roll from 39 to 44. Along the way I get dual wield and get some nice 1H maces with fiery enchants.
Date: 11/30/2007Decided to focus on playing the shaman. I roll from 44 to 48 with no rest bonus most of the way.
Overall, from 33 when the patch came out until now at 48, I think I'm averaging about 90 mins per level. At 48, I think about 2 hours per level when I have a good set of quests in front of me. My overall impression is that the changes rock. I can't imagine the "easy to level toons" now, like a hunter.