We've had 2 hooneymoon shoots (booked one session for our engagment pictures) and we didn't get too close to the castle either time.
The honeymoon shoot is a standard set of locations around the park including by the Jungle Cruise, where they had us put on Mickey safari hats (actually, that picture came out great for some reason...)
The pictures we had with us and the castle are all taken far way so that the entire castle can be seen - there were no close-ups against the bricks.
The best way I can think of to describe our honeymoon shoots is if you took one of those fold-out postcard booklets of the Magic Kingdom that they sell in all the gifts shops and imagine the two of you standing in each shot, that would be close to what you'll see.
We did have the added bonus of getting married in December, so we had lots of holiday decorations in ours as well. Probably our best shot in both of them was the two us taken on the Train Station platform with the castle in the background. Ours had the big Christmas tree in the shot, too.