Sam is not talking about grinding mobs as a raid. What he is describing is as follows:

He has five separate groups in an area.

Group 1 tags mobs and groups 1-to-5 nuke them down. Group 1 gets the exp. Rinse and repeat until they get the level he wants.

The group 2 tags mobs and groups 1-to-5 nuke them down. Once they are done, group 3 tags mobs. Etc etc etc

Yes, it's a grind and yes, it will be awfully boring and respawn timers might make that even worse. But as has been said before, if you've leveled up in Everquest before, leveling 1-70 in WoW will seem like a breeze.