I'm not sure I've linked this correctly, but this is our trip report from a Halloween on the High Seas cruise. We celebrated an anniversary on this cruise and it was just the two of us. Someone mentioned above the extended verandah. We had one of those rooms and loved it so much, we've booked it again for our cruise in May. These rooms have great views!
As for the kids...yes, they're there, BUT there are numerous areas for adults as well. Not once have we ever felt overrun by kids. We stay away from the family pools. The main dining rooms were about the only place we had extended time with children. No issues.
If you love Disney and want to do something Disney that is not the parks, I highly recommend a Disney cruise. Just one will be all it takes to become hooked.
Trip Report - Adults-only cruise- The first part is a short park stay before the cruise. You may have to scroll through several pages to get to the actual cruise.