In about 550 flight hours in the 737 (since late April) I've had one go-around. It was landing at Denver when the small aircraft which landed in front of us became disabled on the runway.
Go-around power, on the Boeings I've flown at least, is not full power because you simply don't need it. Full power is available to us but the first activation of the TOGA mode (TakeOff/Go-Around) gives you enough power to climb at about 2000fpm (feet per minute). Also, the pitch attitude is not any greater than it would be on a normal takeoff.
It does make for two busy pilots for a few minutes as there is a lot for us to do in a short period of time to accomplish the go-around and get setup for another approach. That's why you don't get an immediate PA from the Captain explaining the go-around.