I take it you're playing your shamans as enhancement? Most people go for elemental in PvP. It has a ton of burst and allows you to stand a bit outside the "action" and kill people.

If you are set on running enhancement, there is going to be more than a few times where one dies, I usually just run into a big group of people and try to drop as many as I can before they finally wipe me out. This seems to be the best way to get them all back together while not have a guy stand in a GY too long.

If you have more than 1 shaman I would suggest always having at least 1 of them drop a tremor whenever they drop totems. More than 3 of them dropping a totem at the same time and you don't really gain too much more protection. These guys are good to drop the other buff type earth totems.

If you get spread out to different GY's have an auto run key setup on each guy, and just point him in the direction of your group and try to get them to meet up somewhere in the middle. /follow stops the autorun so you can just get near him spam follow a couple times and you're good to go again.

Basically it comes down to a ton of practice and seeing what works for you.

Good luck