it really does depend on you and your families needs and wants for a vacation.. if this is how you usually do your trips, then
Disneyland should be no different.. but if this is a new thing for you, then I would be asking myself why take a family trip to Disneyland and have someone else be with my children.. and I get wanting to have a date night etc.. but again why have a family trip.
There is a program called rider swap, that allows one adult to go on a ride with another child or by themselves, while the second adult stays with the child that cant/wont ride. then when first adult has come off the ride , the second adult then goes through the fastpass line using the swap card. if the first child wants to go on the ride again, they can with the second adult..
Hope you have a great trip