i don't like the ribbon interface either. in my opinion they should have atleast kept it the wildfire way. primary reason being i guess that we all are so used to that kind of interface.
now i have been one year on creo 2.0...i still feel it hinders productivity....
even guys who have initially trained on creo 2.0 and now working on wildfire 4.0 like the wildfire 4.0 interface more.
but i have interacted with guys who have switched from other ribbon based 3D parametric softwares..and yes they like the new creo 2.0 interface......but these other softwares have long been on ribbon.
creo interface should always have been in wildfire mode, that is also what made it different....but now since it has changed...they should keep it this (ribbon) way..and only try to make it more user friendly.....otherwise if they change again....that would really really make all very angry...!