many podiatrists have told me Dansko's really aren't that great unless your feet are all-purpose kind of feet, since they have such a heel and crazy arch built in. Your feet love them or hate them usually, and if they love them, great, but they're not the only or even best shoe out there. There are a couple of models of Dansko's that are made to have the insole removed and an orthotic put inside, they are very attractive with pants and very comfortable, especially given that you can stick anything inside them to accommodate your feet. Any podiatrist is going to tell you the best shoe you will ever wear is a comfortable stabilizing athletic shoe. Go to the podiatry threads and ask this question, they will not only know what's good for your feet but what dress shoe torture devices are a fair compromise.
I've always worn sneakers in the hospital. I buy black ones so they're more "professional" looking. Wearing sneakers has been surprisingly well tolerated by my peers. The patients love it. If they say anything it's always to compliment me on them, I tell them that dress shoes look nice but they're not nice to your feet, athletic shoes are, and as a healthcare provider that's what I recommend people wear on their feet so I figure I should practice what I preach. They all seem to get a kick out of that.
I'm always saying to never assert yourself or make waves and keep your head down, but if your feet go so does your career. Cherish them with the most comfortable shoes you can afford and get away with at work.
All the brands mentioned here are good options. The podiatrists can recommend sneaker brands better than I can remember what they've told me off the top of my head.