It looks like the Favorite Channels are starting to show up on the Programming Guide at the top of the listings. This is OK, but still inefficient. One of my favorites is channel 13.4. Now it only shows up at the top of the guide, and is missing from the overall listing. So if I'm in the Programming Guide near channel 13.4, I have to scroll all the way to the top to get to ch 13.4. A better implementation would be to have the favorite channels still show up in the overall Programming Guide AND show up at the top. Also, there should be a button that allows the user to go to the top of the guide.
It seems like by minimizing the number of keys in a remote, Roku has made it harder to go to specific channels.