I don't mind drastic changes, necessarily. When 11 got his first control room, it was because the old one got destroyed when 10 blew up.
I suppose this new control room could be reminiscent of the Doctor's state of mind. His last one was full of bright lights and goofy controls; he was happy and married and loving his travels with the Ponds. Once he lost them, maybe that old control room held too many memories for him, so he stripped it down to its barest essentials.