Ok, let's get this one out of the way:
is, well, fucking huge!
It's almost half a mile long, and as tall at 40+ story building having a mass of 4.5 million
It is, in fact, a "moving mountain."
Without pulling out my blueprints, doing some measuring and math I can't say for sure; but I'm guessing that the amount of air inside the main shuttlebay wouldn't be nearly
enough to move the ship in the significant way we see in the episode. Especially since the air would also have to overcome the ship's own inertia and momentum it already had. And given the ship was without power and had no engines, it's unlikely any "mass reduction" systems were operating to allow for the explosive decompression to have a chance of doing something.
Is there really more than 5 million tons of air inside the shuttlebay? A single 10x10 foot room has about 75 pounds of air in it early morning thinking/math tells me that...
The shuttlebay would have to be damn
big for the explosive force of it to have a chance at even nudging the Enterprise
out of the way let alone making it quickly maneuver out of the way.