I'm introvert (but a socialized extrovert because of my job) so I understand the discomfort with shared tables. It's a reason I don't like to dine at Oktoberfest in Germany at Epcot. I see a cruise a bit differently, though. There's a camaraderie that emerges from being in a closed social system for a week, and I expect to get to know people a bit more. Then again, I also have European parents for whom sitting at shared tables outside the home is not unusual, and I go on retreats where I share meals with strangers, so I have a default social setting that kicks in. We're all Disney fans on the ship, so it's easy to find common ground and carry a social conversation. No deep sharing needed or expected.
Where I'm much more aligned with those who want private tables is anxiety over how we would be matched up. As a childless gay couple, we are quite used to being on the "fifth wheel" when seated with families and would not want that experience for a cruise. Seated with other adults of a similar age would be fine.
Ironically, we've never been paired with strangers on a
Disney cruise. On our first cruise, we meet a couple online here on the DIS. Bonded over where to find good wine in S. Martin. We decided to link our table seating and it was done. Now, there was some residual anxiety. Turns out he was former military working for the police. Yikes! What did we as a gay couple get into with a likely conservative?! She was former Baptist turned Wiccan. Yikes, she thought. What did my husband do to me by putting us with two Christian clergy?! We all met on the night before the cruise and have been good Disney friends for 11 years, meeting up most times we go down to Disney (they lived in FL).
Second cruise, an online couple I knew happened to book the same cruise we were on, so we linked dining reservations and finally met in person. Have been friends ever since. Last cruise, we arranged with college friends, so we all knew each other fairly well. Next cruise, linked with friends from 2nd cruise we only see online and very rarely in person.
I get that families have family dining time and it's important to them, and vacation may well be the only time they dine as a family. There are also people who like the social aspect of cruising, or at least understand that good can come from it (i'm in the latter category). Disney needs to accommodate both. Even as an introvert, I would feel very isolated if it was just my partner and I on the ship with no meaningful interaction with somebody else. For us, that would be meal times as we don't club. It's just part of being a group, which I see a cruise to be.
Dirk