I have no problem with servers making a decent amount of money and usually tip fairly well at restaurants. However, with the price of some of the meals at Disney, I find the forced 18% tip for groups over 8 a bit high. We have a group of 15 going to Chef Mickey's over Christmas. Our server will get over $80 for a tip for the hour we will be there. Chances are that at a buffet our server will be able to handle a few more tables than just us during that hour. That means that our server will probably be making over $100 in tips during that hour. Many people don't make that in a day at their jobs. Now, before I get flamed, I know that being a server is a very hard job and I have the utmost respect for them, but I also don't think that we should believe that servers at Disney are too hard done by. Restaurants are usually fully booked and if the servers are getting 15-20% of the amount spent on meals, I think they are doing quite well.
A large table is a lot of work. 45+ plates to clear,at least, 30+ water,drinks, extra silverware, whatever you need. That said, I think you're better off with the 18% figured in. The waiter won't be concerned about being stiffed, and hopefully you'll have great service. If you don't, speak up.
It's the holidays. Enjoy your meal, and feel good that you've been fair to the servers, too. Bless us everyone!