private final String excludedWizards = "org\\.eclipse\\.ui\\.wizards\\.(import|export)\\.(?!Preferences).*";


AbstractExtensionWizardRegistry wizardRegistry = (AbstractExtensionWizardRegistry)WorkbenchPlugin.getDefault().getNewWizardRegistry();

IWizardCategory[] categories = WorkbenchPlugin.getDefault().getNewWizardRegistry().getRootCategory().getCategories();

for(IWizardDescriptor wizard : getAllWizards(categories)){
  if(wizard.getId().matches(excludedWizards)){
    WorkbenchWizardElement wizardElement = (WorkbenchWizardElement) wizard;
    wizardRegistry.removeExtension(wizardElement.getConfigurationElement().getDeclaringExtension(), new Object[]{wizardElement});
  }
}


private IWizardDescriptor[] getAllWizards(IWizardCategory[] categories) {
  List<IWizardDescriptor> results = new ArrayList<IWizardDescriptor>();
  for(IWizardCategory wizardCategory : categories){
    results.addAll(Arrays.asList(wizardCategory.getWizards()));
    results.addAll(Arrays.asList(getAllWizards(wizardCategory.getCategories())));
  }
  return results.toArray(new IWizardDescriptor[0]);
}