So I managed to hit level 90 on my warlock yesterday. Overall, the leveling process in MoP was extremely smooth for me. It wasn't even remotely about speed leveling as I was enjoying reading the quest text and also managed to get both tailoring and enchanting to 600 pretty easily over the course of leveling.
Interestingly enough, looking at the process going forward, it seems that there is still plenty to do at level 90, so unlike previous expansions, I'm probably not going to jump right in to leveling my next character.
My first task once I hit 90 was sort of a selfish and silly one, but I grabbed Pandaria flying and immediately set about grabbing all the various books and scrolls needed for Lorewalker rep. The whole process took maybe two hours, but at the end of it, I had a nice styling new flying saucer mount. Watch out Malygos!
It's then been quite an effort to sort through all of the dailies that are available and which ones I really need for advancement. From a professions standpoint, August Celestials and Golden Lotus seem to have what I need in terms of profession recipes for this character, and then I'll need to add Shadow Pan and Klaxxi to have access to the full suite of Valor Point gear. All of these only need to be at revered. The additional rewards at Exalted are basically just mounts.
Then there are several other factions with dailies available including Tillers (which will allow me to upgrade my farm), Anglers (fishing gear and mounts), and Order of the Cloud Serpent (a must for jewelcrafters, but basically just really cool mounts for me).
The only other interesting factor her is that you have to have your Golden Lotus rep to revered before you unlock the dailies for either Shadow Pan or August Celestials. It looks like I've probably takes about two days to get to Honored with Golden Lotus.
I also managed to run my first heroic on Joar - got Siege of Niuzao Temple. No gear dropped for me, but it was a quick and easy run. So it looks like it will be a lot of dailies and heroics for a while until raid finder comes out. Will be interesting to see if it's enough to keep me from hopping into leveling on another toon.