Key-value accessors aren't exactly the shining moment of verbose method names (It's even been leaked that 10.8 has dict[key] sugar), but for methods with more parameters, it's much nicer than positional. e.g.:

connection:didReceiveResponse: addObserverForName:object:queue:usingBlock: drawAtPoint:forWidth:withFont:minFontSize:actualFontSize:lineBreakMode:baselineAdjustment: