role of JavaScript in selenium web automation testing

We use JavaScript to at two places as of now in web automation testing with selenium:

Interface JavaScriptExecutor in java will help to use execute javascript code in selenium

Scenarios where we use JavaScript:

1. To enter value in input field without using .sendkeys  method

2. To use arguments[0].ScrollToView   -- which scrolls to the element on the webpage

public void ScrollclickJS(WebElement we) {

              JavascriptExecutor executor = (JavascriptExecutor) driver.getWebDriver();

              executor.executeScript("arguments[0].scrollIntoView();", we);

              executor.executeScript("arguments[0].click();", we);

       }