So I finally managed to get my monk to 90 last night, so after a short delay caused by the creation of the new monk class in MoP, I'm now back to having a max level toon of each class.
My total played time to 90 on the monk was an unbelievable 2 days, 10 hours and 35 minutes. Certainly the xp buff from the monk daily quest plays a huge role in that, along with a new piece of heirloom gear.
By way of comparison, the last character that I leveled straight through to max level was my warrior at the beginning of Cataclysm, and at that point, it took a played time of 3 days, 23 hours (and also with full heirlooms, other than the pants, which didn't exist then).
So they've clearly done a lot to further streamline the leveling process.
So the downside of the speed up in the leveling process, is I didn't have to quest anywhere close to all the way through Dread Wastes before hitting 90, so even with the shiny new ilvl 450 staff that you get from the level 90 monk class quest, my ilvl is still sitting at 426 or so. So I'm not ready to jump right into heroics.
I've got a decent amount of JP accumulated though, so I'll see what I can do with that, craft some things on my leatherworker, and then see what 476 stuff is available for a decent price on the auction house, and hopefully that will do the trick.