…works for 2.8, too! The code to be replaced moved down a couple lines to 2351. Here’s more detailed instructions:
exclude_tree bugfix for WP 2.8
@thelim3y: Thanks, this is the only version of the bugfix that works for me! I tried all the others I could find – one of them only hid the parent page and the first two subpages, another one just returned an error, but yours does exactly what I want. 😀