With alot of experience of flying on the 737 (various types) I have observed that windows do freeze over but not fully and should it happen, you would obvioiusly at least crack the door and determine the best action from there.
Would you? You would risk "cracking the door" when there could well be water above the frame or smoke/flames in the immediate area of your door? "Cracking" the door without having first had a look of what is outside is dangerous and life threatening. If you can't see out the window, you need to find another way to look outside, thats what we are paid for. You are much better off spending an extra 5 seconds then opening your door and finding water or smoke entering your cabin!
Remember the real saftey implications that you were taught in SEP. Telling your company that your view (or what you expect your view/opinion to be) isnt to your liking, is not an SEP issue. Boeing would not exist if they were getting it wrong.
This is a real safety issue comment. If at any stage you, as crew are not happy with the condition of your aircraft you should make it known to the Purser/Capt and/or enter it in your cabin log. You should not dispatch if you feel there is a safety issue with your aircraft. Crew MUST be encouraged to bring up ALL safety issues they have with the aircraft, not just ones that were highlighted during EP training. Boeing have got things wrong, aircraft have gone down and thankfully other ones have been saved through the reporting of crew (both tech and cabin).
Remember you have both open and confidential reporting systems in your company for a reason. If you're not happy say something. Don't sit back and say "it must be normal, boeing don't make mistakes", thats exactly how incidents/accidents happen and is an area that shows a lack of understanding in CRM.