Thanks Chief but I've got some sea time and happen to agree with the PO, but I was just relating a learning experience I had (I'm also a PO - well, paid like one). There is a qualitative difference between the glassy water of the straits and the huge swell past buoy "J," but of course sea time is sea time. Orcas occasionally head out there, too, but probably not this time of year.
And as a former sonar op I've stood far more watch on deck than I care to remember, so I'm extremely familiar with seamanship, ship's husbandry and all the associated fun and value.
Frankly, I've had much rougher rides in small boats and ships than in any destroyer. As far as I'm concerned, if there's room to manoeuvre, you're at sea, regardless of what's on the horizon.
I think the gist of Chief Stoker's comments about watch on deck was that you called it "boatswain stuff." His point (and I agree) is that it is not exclusively "boatswain stuff." It's all "sailor stuff," which is "everybody on board stuff."
For the OP:
There are two basic rules of thumb in the Navy: 1) show up on time, and 2) be in the proper dress. Many indiscretions will be forgiven (in the long run) if you simply follow these rules. If you are required to "live in" quarters, as long as you show up on time and in the correct dress, no one cares where you actually sleep (other than a jail cell - and even then, you'd probably have to do it more than once before it becomes a major issue - as long as you show up on time and in the correct dress).
As someone else pointed out, if you are single and ordered to "live in," you will have to pay for rations and quarters (R&Q), which isn't cheap. However, if the plan is that you will be in Esquimalt for awhile, you may be allowed to move out and get your own place (and stop paying R&Q and pay rent instead). It never hurts to ask. Whether your girlfriend moves to Esquimalt is entirely up to her. Just realize that you/her may be on the hook for all the expenses associated with that.