It's very similar. There has been no attempt to use the HD menus so it should be just as easy to navigate.
The only difference would be maybe some HD-only channels that are not available on SD, but I'm sure you've already found out if this is true - or a problem.
THere are some updated search features, but nothing that would be a problem to a blind operator, AFAIK.
"YOU! YES YOU! STAND STILL, LADDIE"
"How can you have any pudding if you don't eat your meat?"