I sailed in balcony rooms on Royal Caribbean's Utopia of the Seas and Virgin Voyages' Valiant Lady. My Virgin Voyages' balcony room had a nicer bathroom and these cabins tend to be a good value.
I'm a frequent cruiser who's been on over 50 voyages, and I never book balcony rooms on ships. Most balconies fit two people, so my family of three can't even comfortably sit on them together. Balcony ...