I am a prot warrior, I use this when I mine. I hit the boar up, it aggros the mob camping the node, and I go to town mining the node, so no one ninja's it.
If I had to kill the mob without the boar, there is a big chance someone will drop down and start taking the node from me, and I have no Feign Death/Vanish/Ice Block to dump the mob on them to defend the node, so this is an awesome trinket for that.
I dunno bout you guys, but I hate clearing the mob next to a node, getting said mob to about 40%, then seeing someone jump off their flying mount and start mining the node :-\