You obviously didn't have a Tivo previously with dual buffers.
My simple answer - why record the programs if you don't have to? It comes down to what you're watching. If I'm just watching shows in general, I don't use it. I use it most often when watching sporting events. I can pause a game I'm watching, then go surf on the other tuner (often when the first game comes to a TO/commercial), maybe even checking out another game. Then when i come back to the original game I know I haven't missed anything because it's right where I left it.