The 40-year-old said he admires his wife's maternal temperament.
"I am not very present in the rest of my life. My wife's very patient. She does everything. If I have time, I try to spend time with the kids, even if just to be a physical presence, the bath, whatever.
"But my mind's always going, 'How are we going to light that shot tomorrow? 'What's the master shot for that scene? Is there even going to be a master?' Just ruminating endlessly. Because for me -- I wish it was discipline or being a great artist. But it's just anxiety," Affleck told Detail magazine.
The 'Argo' director raises Violet, six, Seraphina, three, and six-month-old son Samuel with Garner.
Despite his busy schedule, Affleck says his attitude to work has changed post marriage and children.
"Anytime you think, 'I'm wasting my time here,' the first thought you have is 'I could go home and be with my kids.'
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But he joked it is not long before he starts worrying about work.
"Now, you may go home and be with your kids and very quickly start thinking, 'I wonder what's on the work front?' Because running around after three kids is very trying."