I am having a nightmare trying to use razor to output the umbracoFile path of a media id.

I have found several posts and proposed solutions to this but nothing seems to be working.
http://allan-laustsen.blogspot.co.uk/2012/04/umbraco-razor-dynamicmedia-umbracofile.html
http://umbraco.codeplex.com/workitem/30778

I am running version 4.7.2 which is supposed to have the fix in but it doesn't seem to work and I am loathed to go through all my code and replace:

@inherits umbraco.MacroEngines.DynamicNodeContext
@if (!string.IsNullOrEmpty(Parameter.Image)) {
  var image = @Model.MediaById(Parameter.Image);
  <img src='@image.UmbracoFile' alt='@image.Name' />
}

with:

@using umbraco.cms.businesslogic.media
@inherits umbraco.MacroEngines.DynamicNodeContext
@if (!string.IsNullOrEmpty(Parameter.Image)) {
  var image = new Media(int.Parse(Parameter.Image));
  if (image != null)
  {
    var url = image.getProperty("umbracoFile").Value.ToString();
    if (!string.IsNullOrEmpty(url))
    {
      <img src="@url" />
    }
  }
}

simply because the shorthand is supposed to make development easier and quicker.

Has anyone actually fixed this? Open to any tested ideas before I chuck Umbraco out of the window and move to sitecore?!? I can't have a site just suddenly lose every image on it because of a release and then have something marked as a fix which clearly isn't. Argh - Umbraco!!!!