I was down in Sept. and ate at a couple of Disney restaurants and BOMA was one of them. While you don't expect the type of service that you normally get at a full service restaurant, your server should be clearing the table as you finish with one trip to the buffet and should keep your drinks filled. They should also fully explain the process at their particular restaurant.
I have found the absolute best server at BOMA, his name is John and he is just great. Very friendly, fully explains how BOMA works, keeps the glasses full, the table clean and will inquire about any special occasions. He then will arrange a special surprise for you at dessert time.
He has done this every time I've been there, ( We go to BOMA every trip at least once) and have not been on the dining plan (FL res AP's and stay at my Deltona house and use DDE)
Last month, I requested John special again (as I always do now), DS and I were seated, John remembered us and greated us warmly and brought a mickey cake at the end of our meal, "just because"
I have had a couple of bad servers, several mediocre ones and many good ones. Like any other service related industry, you can get all types and everyone can have a bad day. I have seen a trend in service to the "less attentive" everywhere and not just at Disney. However, I tend to hold Disney to a higher standard and I am disapointed when they do not deliver.