The tutorials for cloaking in the dldb suck. And if you think the glitch cloaking is hard, then you probably just play a lot of mass games over Battle.net.
METHOD ONE: Have all units burrowed in a line, then order an arbiter to move towards the line. At a certain position, have the units unburrow using a move trigger. Only problem is burrowing/unburrowing will uncloak the unit again.
METHOD TWO: Zergling, Hydra, Drone, not sure about defiler or lurker, can be cloaked with triggers. I'm not going to post some meaningless bull

, so expariment with it.
METHOD THREE: The ultimate, unfinished, and PC-Only, cloaking expariment. Player 161. Preplace all the units(burrowed) anywhere you like. Then place any unit for player 161 after. Unburrow the units and they should be cloaked. I believe burrowing/unburrowing will not affect their cloak.