I've commuted for 18 years, and in the middle there were 3 or 4 years where I rode clipless and developed enough skill and confidence to use them relatively effortlessly and fearlessly. The pedals give you a zen like feeling of connectedness to the bike, and unclipping becomes second nature after a while. However, I went back to flat pedals when both sets of clipless (winter and summer bike) wore out and I don't miss them in the least. No need for special shoes, no trouble walking from the bike to the office or into the house (even mountain bike shoes clack after a few wearings), no constantly clipping in and out at every stop light. Despite some claims to the contrary, they offer negligible efficiency benefits in utility riding. I often time my ride home and there is zero difference in my times with and without clipless. It took a couple of days to lose the tendency for my foot to float off the pedal at the top of the stroke, and to relearn the habit of swinging the pedal to the correct start position when I stopped, but that was it.

There is no doubt clipless pedals are an advantage in intense riding, like racing, but for me, flat pedals are by far the better choice.