Since I'm such a wooz (spelled right?) I got scared every 5 min But the coolest/scariest moment I recall is the moment the first Pinky appears trying to knock down the door. That was really tense ...
I really dont mind the waiting time - like Nosferatu said, they learned from experience just like Valve did with HL1 and HL2. I still have faith in 3DRealms... DN3D Forever!