This server has a mature base of players. Due to the low population, raiding activitiy in trade channel is quieter than most servers for forming pugs. Guilds are also experiencing high atrophy.
Generally speaking it's a great server for RP and questing. Not ideal if you want to have raiding success or join a pick up for a casual run etc.
The question is will we still be looking for our casual pug raids in Trade come the new LookingForRaid tool in a future patch?
Keep in mind I'm not advocating it's use - there's something to be said about joining a raid guild to, well, raid. But if you're pugging in Trade, I don't see what difference or harm using LFR instead would be. Groups will certainly form faster, that's for sure. So a quiet Trade shouldn't be a huge deal. (In my experience, it's still decently busy. It's just not Faster Than Light like a high pop/full server.)
Cenarion Circle is an RP Realm. To whit, join an RP server for RP and its community. Join a guild if you want to raid, there are fewer than on PVE servers but they still exist and still progress. Lastly, use the upcoming LFR (when it's released) if you want pug raids.
My experiences on Cenarion Circle have only been positive so far. Far fewer ignorant fratboys (that seem to plague PVE servers) and a greater attention to etiquette and familiarity.