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The actor tells Extra that his 6-month-old twin sons "are developing beautifully ... It's a lot of fun."
It's a sentiment he echoes when asked about filming the latest installment of his hit TV show: "It's a lot lighter, people are having more fun."
"The energy and the adjustments make a big difference," he says, referring to the departure of Isaiah Washington after an on-set altercation between the stars last season.
Definitely pumped to be back at Seattle Grace, he declares, "I'm going to go save some lives again!"
Dempsey, 41, who races cars on the Hyper Sport racing team, plans to have twins Darby Galen and Sullivan Patrick driving "soon enough."
"You can get those little go carts," he says, but there'll be "no pressure" for them to race like dad.
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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