This works especially well for me, and I've been using it to speed up questing, etc. since level 68. For healers and tanks it's a godsend, due to the instant pops most of the time, dps it's probably less worthwhile.
Basically, que for the instance in the zone of your choice. When it pops, and you're zoned in, just aggro mobs and die. Once at the graveyard and in ghost form, leave the party, switch the dungeon difficulty to heroic, and zone in. You're now in the zone you intended, and you don't get ported back to where you accepted the que.