The difference is that once your layer list is larger then the Layers palette, then when you auto select, then the layer list auto scrolls to the activated/highlighted layer.
But agree, not what you are asking for. Auto select is a UX thing that may help some users, but irritates others. Including me. For example when I paint and have separate layers for background / sketch / foreground / highlights etc., it is very easy to auto select wrong layer, especially background and paint inside it. And all the advantage of digital painting, a chance to have things separated, is lost.
Disable auto select (or at least a proper full locking) is a must have feature.
I don't see any difference between it being off and on. And I wanted to turn the "auto-select" feature off - if I select one layer on the right, I want to be able to click anywhere and move just the layer I selected. Is there a way to do that?