thedungeondelver
Adventurer
I have - and do - use DWARVEN FORGE on many occasions. I use it with homebrewed adventures as well as with modules.
As someone else in the thread does, I use black cloths to cover up unexplored areas of the dungeon. If there is a potential for the players being surprised by the monster (for example, spiders clinging to the ceiling of a room) I leave the room unpopulated. Generally I have the miniatures (both metal and pre-painted plastic) in place already.
I have on occasion used it for the great hall in G1, as well as the central room and surrounding environs in the dungeon of the same module.
For a con I built the entirety of the Tomb of Horrors - sadly, the only pictures I have are grainy ones I took with my cell phone.
I have enough to build the entirety of the Moathouse dungeon from T1 THE VILLAGE OF HOMMLET. Unfortunately, I lack the physical space to assemble it all

I have some photos of various times and places I've used it, would anyone care to see?