If you want the best of both world book a porthole room.. You get it at the price of an inside yet you can see some of the ocean.. you also have a couch you can sit on instead of a small chair,, The bigger ships to me have alarger outside cabin, Not HUGE but a little more room because of the couch thats in the room.. The older ships are the same..
I know on the Fantasy class ships the interior cabins are the same square footage as the Ocean Views at 185 sq. ft. For the price difference, I am perfectly happy in an interior cabin. I understand people that don't get to see the ocean very often wanting them though. I see the ocean almost every day of my life, so is no big deal for me. Plus, I am rarely in the cabin except to sleep and shower.
The cabin size is the same as mentioned@185 For CCL. The windows can become salted and limit the visabitily. I have stayed in an IS when sailing with a child that won't look out the window (silly girl will run on deck if I don't hold her hand each moment). The TV suggestion sounds great and I will use that my next time trapped IS!