I had an hour long wait when I went for ice cream one night. I have heard people say they walked right in before though. It depends on when you go perhaps.
It depends, we went twice in May. One time we got there at about 12.15pm and had less than 10 minute wait. The 2nd time got there about 1.30 and waited an hour. Well worth the wait!!
As others have said, a definite hit or miss on time. I can tell you the kitchen sink is a great afternoon break and snack to share. Takes time, lets you cool off and refresh, and from 1:30-3:30 it's fairly quiet for tables.
I have seen no waits, 10 mins wait, and well over 1 1/2 hrs wait/ Get there for opening or at an off time.Avoid like the plague at traditional meal times and after illuminations lets out and you should be ok.
In the afternoons you can usually walk right in, but during the dinner hours it is pretty crowded. There are only a handful of tables at B&C, so that makes it even more challenging.