Yes, but I will point out that the normal Enterprise had places where the only thing between them and vacuum was a force field anyway. Picard comes across one of these in the movie First Contact, for example.
But yah, considering all the strange space stuff they run into, I guess it's good to have a shell around them. I can't think of a single episode where the power went out all the way (maybe the one where Troi was in charge and they hit a space-bomb or whatever?), but there are a few where the computer goes nuts.