I currently have the 3-disc plan, but I think I'm going to drop to the 1-disc + streaming. We're horrible with actually watching the discs as we get them and sometimes they sit for weeks before we get around to watching them.
I used the RedBox for the first time the other night. My son had a friend spend the night and they wanted to watch Diary of a Wimpy Kid. That is a neat process for the occasional short notice movie, but Netflix is still the best option. I wish more new features were available to stream though.