I don't take my work home with me, I don't check my work email when I'm at home. It's just not worth the stress to me.
I love my job, I love my work, I feel like I'm contributing to making the world a better place -- it's just not 100% of who I am. I have a dog, a girlfriend, a handful of close friends, a few engaging hobbies, and a ton of books to read and miles to run. I'm more than my job, and once I can pay the bills, the rest of the money is just a nice to have -- but not nice enough to give up my health and sanity.
Then again, I'm extremely lucky to be in this situation, and a lot of people aren't. Some of my coworkers work long hours still, but they seem happy about it. As long as that's true,... well, whatever floats your boat, right?