Celebrim
Legend
One of the big things that differentiates my AD&D campaign from a standard D&D campaign you run in your home is that I'm running it in my FLGS, with an ever-changing array of players.
Been there (well, not my FLGS, but as the in house DM of a FLGS), and yes, this is the one circumstance I've found where the mega-dungeon absolutely makes more sense than any other approach to the game.