I think Q, Who is one of the few times that the "conference room" detour actually works. Part of it is the exposition we're given and part of it is that Stewart and deLancie are such good actors that they can sell the peril of the situation even from the conference room.
Unfortunately, among the regular cast there just wasn't any other actor as talented as deLancie to play off of Stewart.
What bothered me about it was that everything would stop so that they could give some exposition and give the more minor characters some lines. And I'm talking here about all the series, not just TNG. The worst at this was Voayger (which I'm actually a big fan of) where they would discuss important issues with the chef and the botanist.