PHPExcel y ajuste de texto

Aplicar a un rango:

$objPHPExcel->getActiveSheet()->getStyle('D1:E999')
    ->getAlignment()->setWrapText(true); 

Aplicar a una columna

$objPHPExcel->getActiveSheet()->getStyle('D1:D'.$objPHPExcel->getActiveSheet()->getHighestRow())
    ->getAlignment()->setWrapText(true);