Well, a rogue in PnP would be able to perch or hang off of ledges to eavesdrop, to run along rooftops, stand along windowsills, or otherwise make use of their environment to actually hide themselves. You can't really do that too well in NWN. Moreover, most rogues who aren't shadowdancers I've known and encountered who like eavesdropping on conversations make themselves invisible first, either through use of a spell, scroll, or potion; in part because most recognize a perfectly mundane rogue shouldn't be able to just listen in.
The rat-race goes both ways, incidentally. Most characters aren't ever going to get high enough Hide or Move Silently to beat out a dedicated detection build (or just a Bard with half-decent Listen and Amplify, if we're being honest with ourselves here), with how starved rogues have been for loot, lately. The last sneaky character I had, had pretty high Hide and Move Silently, yet at the time I closured her, she could still be caught through traditional detection.