I have regular shoes at work and don't intentionally stop and walk on my commute. I use SPD-SL on my commute. One time I had a breakdown that caused me to walk half the commute (6 miles) in my bike shoes and I found it easier to walk in the carbon soled bike shoes (I now wear) with SPD-SL cleats than the old plastic soled bike shoes with the SPD cleats that I used to wear. At any rate on my commute I wound not consider using anything other than road shoes with road pedal/cleats. I've tried the off-road shoe and cleat and this is better for my commute.
You can get all the advice in the world but at some point you have to look at the various aspects of your commute and your bike and make your decision based upon that and not someone elses' ride.