Boma is one of our favorites. We go every trip, sometimes for breakfast, sometimes for dinner. By lines do you mean to get in & seated, or lines at the buffet? Boma has been full every time we've been there, you'll need an ADR, for sure during Spring Break. We've often waited 10-20 min. for our ADR time. As far as lines at the buffet, I've never been more than 2-3 people deep waiting, and even that's rare. Like the OP said, it's set up in stations & you can walk right up to each one individually.
We love all the stations! I love all the African spices & sauces they offer, and the soups too. I've never been overly impressed with the desserts, but there's soooo many to choose from, everyone will find something!