Create an emotional aftermath to the carnage
The powerful sequence in which Godzilla destroys Tokyo is the centerpiece of the original film, and with good reason, but what comes after is almost more powerful. After carefully engineering a sequence of pure destruction, Honda and company take the same care in depicting the aftermath of that destruction, and it's devastating. Godzilla does more than just crush buildings. He ends lives, and puts others in further danger with his radioactive atomic breath. In one particularly chilling moment, a doctor holds a radiation detector up to a little child, checks the reading, turns to the child's mother, and sadly shakes his head. It's a brief moment, but if you really let what it means sink in, you realize this is a situation with real gravity. You could argue that this kind of sequence will slow down the action, but if you do it right, you keep the audience hooked, and it makes what happens next matter even more.