My wife is addicted to WWF and constantly has at least a dozen or so games going on with her regular group. They can regularly get 4 or 5 row blocks (would make big rooms in your dungeon)
Sadly, for an ex Scrabble player, I find it to be a crime against the English language; a lot of the words used are nowhere to be found in Chambers

Have to say, we have never thought of it as a dungeon planner.