I'm going to guess wearing bicycle shoes all day is bad for your feet. They are designed to be firmer and less flexible to transfer power to the pedal--not conducive to walking and standing. Plus, you'll "click" all the time. DH has some spinning shoes that are recessed and don't "click" but my Nashbar sandals definitely do.

I use SPD's--DH switched pedals this year and discovered they aren't compatible with our winter spinning bikes, so he had to buy a second pair of shoes. Just a thought.