It's fine to move about with a sleeping laptop if you take the proper precautions. I generally move about with mine in its padded carrying case which protects it from the jars of a person walking and inadvertently brushing up against stuff and bumping. I lay it flat (within its bag) on the seat in my car with no problem, get to my destination (like class, for instance), open it up and go.
I haven't flown since the stricter security went into effect, but when I went to the airport and through Security, they wanted to see all laptops working. I didn't have to wait for mine to boot up like some others did....
I tend to restart perhaps once every couple of weeks, and about once a month (or so) I shut it down completely overnight. The rest of the time? I'm either using it or it is asleep.