Sliding doors are an efficient use of space. They do not extend into the room, or require that the space outside the door be empty. They work quite well on the U.S.S. Enterprise, where the computer opens them for Captain Kirk and they never get in his way. You can even open them just a crack to let in bugs and fresh air.
But when you're carrying a tray of raw meats out to the grill, the last thing you want to contend with is balancing that tray on one hand while exerting sufficient force perpendicular to your direction of movement to open the door.