SMB fishing with tubes in clear water (Sag Bay/St Clair) less than 8 feet depth often requires very long casts, IMHO. But yes, often they hit close. Some get spooked by the boat, some do not. One time I had a SMB at the boat, my cousin was getting the net, and I saw another bass. I told him to drop his tube over the side, he did, and immediately had another on. Both over four pounds.
I remember times having the boat anchored and fan casting very long distances downwind after having covered the water in close, and catching more fish. If I had moved the boat down, would I have caught them anyway? I don't know, but why move if you don't have to. I think there is a place for very long casts.