I love riding clipless. I used to leave shoes in my desk and change into them. I can't understand why you wouldn't want to do that. I definitely would not want to walk around all day long in bike shoes, even ones designed to walk in, like MTB shoes. After ten years of riding clipless, unclipping has become so automatic I'm not even aware of doing it, have done it while falling (e.g. wet turn taken too fast), and it's been years since I've fallen over because I didn't unclip in time to put my foot down.