Forming a group to do a group activity is "jumping through extra hoops"? Cool...
Back on topic though, if you are going to try and power-level with these invasions the best way is to form a 5-man group. This way you all share tags and get more exp, but keep in mind some people will only join your group and afk flying in their mounts, not tagging anything and not helping the group at all. Turn on a recount addon just to make sure everyone is doing "some" damage, even if very little. Kicking afkers and replacing them with more people is super fast and easy, there'll be dozens of players just spamming "1" in General Chat trying to join a tag-group.