Collecting a list of subfolder names using Google Apps Script - a try-catch "hack" for increasing execution time

GetSubfolderNames.js

function GetSubfolderNames(rootFolderID) {
  var rootFolder = DriveApp.getFolderById(rootFolderID);
  var subfolders = rootFolder.getFolders();
  var subfolderName;
  var subfolderNames = [];
  
  for (var i=0; ; i++) {
    try {subfolderName = subfolders.next().getName();}
    catch(e){
      if (e == "Exception: Cannot retrieve the next object: iterator has reached the end.")
        Logger.log("Got all subfolders");
      else {Logger.log(e);}
      break;
    }
    
    subfolderNames.push(subfolderName);
    
    if (i%20 == 0) // if var 'i' is a multiple of 20, experiment with this number
      Utilities.sleep(300); // Pause. Helps prevent "server errors" from a ton of DriveApp calls
  }
  
  return subfolders;
}