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Well, for one you shouldn't be taking corners with cruise control... and if DSC wasn't there to step in when you were taking a corner too fast with cruise control on, bad things could happen? I think BMW's reasoning is to protect perhaps not the most intelligent drivers... Buying a BMW today doesn't necessarily mean you care about driving anymore...
Why do you always turn DSC off on dry days? Unless I'm doing something wildly stupid, I can't think of many times when its intervened when I didn't want it to... Sure I turn it off in the E46 Cic when I'm doing some spirited driving in the hills, but i've never had to turn it off because it was intervening during normal traffic conditions. Which makes me wonder about how aggressive you drive... 
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First off, I turn it off because it's no fun. In both my S4 and my X5 I find it intervenes when I'm getting into the throttle on corner exit, and frequently in very tight turns. I'm driving briskly but not very close to the limit, and it happens and it annoys me. In the S4 (and every rental car with TC or ESP) I shut it off (in the dry) for my own entertainment. In the X5 I don't bother, on safety grounds.
The process that BMW's design forces is: hold down the DTC button for 3 seconds, drive until you want to use cruise control, push DTC button, engage cruise, disengage cruise, hold down DTC button for 3 seconds, repeat. For those of us who find DSC genuinely annoying it's a pain. Obviously for normal highway driving I don't find either DTC or DSC to be an issue, but most of my driving involves a mix of environments.
I should be clear: I liked the car very much. It is likely the best line of sports sedans available for any price.