So. I sit corrected. This is what I got back from BMW Canada:
"In reference to your inquiry regarding the functionality of the “Drive Experience Switch” (which we used to call Dynamic Drive Control), the switch controls:
· Throttle/engine response (more immediate in the Sport modes)
· Steering response (more direct in the Sport modes)
· Shift timing when equipped with automatic transmission – shifting points earlier and crisper and “sportier” in the Sport modes)
· DSC (Dynamic Stability Control) threshold, only in the Sport+mode (in which case the DSC is automatically dialed back somewhat to what we refer to as Dynamic Traction Control, allowing a certain degree of reduced traction at the rear wheels for “sportier” driving). The DSC can, of course, be switched off entirely with the DSC swath positioned above the Drive Experience Switch.
Current 3 Series models are not offered with Adaptive Sport Suspension, however, if and when they are, the Drive Experience Switch (or Dynamic Drive Control) would also influence suspension settings, with the electronically controlled dampers providing firmer control and response in the “Sport” settings."
Now I wish I could get that car back to confirm whether I am indeed crazy. I *swear* the car rode more firmly in sport mode.