There's one important thing to note about hunter CC: it's not targetable. So if you have a mage, warlock with succy out, and a rogue, you can sap, polymorph, and seduce the targets all in the same area. However, with a hunter, you have to draw the target into the trap (hence the name: trap) and it requires slightly more finess. So CC in general can be kept in one place, however if you are trapping it's best to bring them to your own little corner.
Also, it's important to note that you should keep your traps out of the pull line in most group situations. That way you control which mob gets trapped, not the tank (if the tank is pulling). And it's also a good idea to seperate hunter traps if there's multiple hunters, although usually each trapping the other's target isn't too big of an issue (unless one hunter is way ahead of the other, in which case he will get beat on).
Last note, a time when we broke this rule was in ramps, when we had like 3 hunters in our group. We'd all drop a trap into the pull line, and the tank would pick up the mob that made it through. Worked pretty well, and we only had to target one mob at a time.