Level path. The zones which most go (popular or high zem).
 

What zones do most peeps usually follow for levels 10-45?

I'm just wondering, does anyone go to the warrens at all? Or group in antonicans, pre-expansion era zones.

Kunark.
Do people go to lake of ill omen often?

Grouping wise the path I usually follow is:
Unrest 10-20
Mistmoore 20-40
City of Mist 40 - 50
Karnor's Castle 50+

While these zones are quite mainstream you really can't beat the xp they provide. Of course there are tons of other places you can go.

Lake of ill Omen has been pretty busy lately for mid 20s.

Crushbone, Oasis, Najena, Unrest, Guk, LOIO has been my leveling path up to 26 atm. There are a lot of cool zones to explore!

This is the path 90% of the server follows. There are plenty of other zones to explore though. Don't limit yourself. :)
CoM is great but I don't exp in any of the other zones on the list.

You can do both upper and lower guk from lvl 5 -53 if you dont want to travel much. wide variety of mobs to kill for everyone.
You can do the Warrens, but id suggest dont go there planning on finding a pick up group since it is on Odus, you may want to build your own group to xp there.

my guide for leveling with finding groups is :

1-15 crushbone/ Gfay / Kurns
12-20 Oasis / Unrest
20-30 Upper guk, Mistmoore & unrest
30-45 Lower Guk, Sol A, and some Mistmoore
45-51 SolB , Dread lands, City of Mist
51-55 Karnors Keep, Seb
55-60 Howling Stone, Seb, Chardok, Velks

I would add WW from about 20-35 as well, giant fort is great money and exp, and can usually at least find a duo there most times of the day..

10 to as high as you want, 20ish?: blackburrow for nostalgia and fangs (has it been nerfed yet?)
10 to ~16: wisps in NK/erud's crossing for exp + serious plat
~14 to 20: oasis fear kiting crocs group with pet classes
26 to ~30: OOT sisters for plat
~29 to 34: HHK goblins and/or guards

I can't stand being in the same zone for weeks. If you've got the plat for ports or some druid/wiz friends, you'll have a blast just sending tells to people within your exp level range who happen to be in zones you'd like to try. Even seriously twinked exp grinders like some company some times.

The problem that i have found is that nobody is ever in Lguk or Solb while i'm LFG.
I would much rather run these dungeons over CoM. I actually prefer to lvl in the old world.

Soo if anyone does anything other than CoM and needs a 45 rogue /tell Batz ;)

It was a little while ago when i was of the correct level to level in guk or SolB, but i did find pick up groups; I may have not found one every day but they were some what common then. Sometimes you just need to make random friends at earlier levels so you have someone to group with later on, especially as a class that requires groups to level.

10-35 Najena. See if you can gather enough bone chips to force your way through 35 with kaladim bone chip quest :P.