When you take the time to really plan your marriage together as partners, you will be able to move more efficiently and effortlessly as a team. It won't mean you'll never have any challenges in your relationship, but having a game plan will make them more manageable.
I believe that's what Ben Affleck meant by it being "the best kind of work". Most of the time the effort should be light and easy so the energy and desire is there when real "work" is required.
More from YourTango: What It Takes To Have A Happy Marriage
If you or someone you know is working too hard on their marriage instead of enjoying it, I am ready to help with expert relationship advice and coaching. You can get more tips by joining my Free program 10 Resolutions to Make Your Marriage Better this Year. My goal is to help you have the best marriage possible and proactively address any challenges you may encounter.