Dress as YOU want @MTemple212. I too have a closet of formal dresses and I take them on cruises - especially European ones. I find they're easy to pack (sometimes less room than a pair of jeans!) and hanging them upon arrival, they're ready to go! I believe everyone goes with their own preferences and everyone accepts each other's choices.
I like a combination of both. For those who want the big picture, you can see multiple rooms, yet for those of us who sail frequently and know specific rooms, I still want and need the ability to enter room #s.