David - while gree with you in principle, when I think back to my cruises on 60-80,000-ton ships I actually think of them as "colder." I think it is the somewhat dilapidated and worn interiors that get to me, like when visiting an older house.
I get more of a charge from being surrounded by the newer.
But I DO agree about the "crowded" issue. If I had to pick a ship for a relaxing cruise, it would be the Solstice or Queen Mary 2; big but also bot crowded.
The smaller ships i don't personally gravitate to much are the oldest Celebrity ships (Century, Mercury). They just don't have the same panache as the newer CXC ships, or even the Millie-class.
I really like the HAL Eurodam as an example of a "right-sized" ship.
I have to say our Crystal cruise was MOST excellent, also. There is a bigger ship but still with exemplary service and great food.
I enjoy Silversea and Oceanua a great deal - but these are always destunation oriented cruises - which truly are my favorite. That to me is the true definition of a cruise - getting away on a smaller ship to great ports of call.
But if you want the 7-day family break where dad wants to walk away the "hero" for his teenage kids, you cannot beat the Oasis and other mega-ships.