Let me add that on the Oasis the bartenders remembered me and my preferences and this was just a 4-night cruise. It wasn't just me either. I observed many passengers being called by their first name as they approached different bars. Granted these were all people with lots of experience, so they are perhaps better at the name game than others, but regardless I felt welcome and "special".
A good crew is more important to making a ship inviting and warm than it's size.