if your belayer cant handle the extra complexity of belaying with two ropes you climbing with some challenged types.
two ropes helps cut drag way down for wandering routes. climbing with two fat ropes is kinda heavy for the leader though. i done it several times (i used to climb with two other guys who fell a lot and it cut down on rope stretch from their fat asses dangling) but it wouldnt be my first choice. i also done routes where cruxes came up early then the route zagged over. i used one fat rope and one skinny one and clipped the fatty first.
it will pay in the long run to learn how to use two ropes. an atc or sticht plate will make it way doable imho.