Get number of Angular watchers in the page

gistfile1.txt

(function () {
    var root = angular.element(document.getElementsByTagName('body'));
    var watchers = 0;

    var f = function (element) {
        if (element.data().hasOwnProperty('$scope')) {
            watchers += (element.data().$scope.$$watchers || []).length;
        }

        angular.forEach(element.children(), function (childElement) {
            f(angular.element(childElement));
        });
    };

    f(root);

    return watchers;
})();

Paste this in the console!
More info: http://stackoverflow.com/a/23470578