No matter what is the shape of different levers or the knobs on the FCU/MCP or the different ways they are designed to operate pilots have dialed altitude instead of heading, pressed Exped button instead of APP, selected parking brake instead of flaps and retracted flaps instead of gear. The only reason is as one gets more and more familiar with the cockpit controls pilot start reaching for them unconsciously and action them without identifying first. These are not muscle memory or unconscious actions but see and do items. This needs to be enforced and corrected when noticed otherwise a slip is just round the corner can happen any time.