Never see much of him, a lot of ships you just have a wine steward now and a small cellar. I normally buy a wine package and prepay the gratuities. I find it easier then if someone goes the extra mile I give them a cash tip.
On RCL the assistant waiter was very good she brought the wine every night, knew exactly what wine I drink and what my wife drinks so I clip a $10.00 bill under the ticket I sign each night for my bottle of wine
I use my time but if you turn up around the same time each night or ask to sit in a particular waiters area they soon sort it for you.