Butcher block countertops would be such a blessing! I'm always searching for my cutting boards and a place to store them, a place to use them, etc. These countertops would solve that problem in one fell swoop. I don't know that I would want all my countertops to be butcher block, but having one or two strategic ones that were sure would be nice.
I think this kind of countertop would be ideal for an island that had a small sink with a garbage disposal. One side could be a butcher block for chopping and general prep work, and the other side could be marble for baking purposes. Well, I can dream, anyway.