pedal advice

I currently have a set of shimano standard spd pedals but I am getting annoyed constantly having to wear special shoes to just cycle to work. I don't like those spd/flats u can get so I. Want to get a second set of flats. My question is does constantly changing pedals ruin the crank arms ?
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Shoes at work - check.
There's already that. My SPD pedals came with a plastic platform that cand be attached to the pedal in order to use normal shoes. Clip-in is very easy but it need some kind of tool to clip-out. Pretty handy.
Link
http://www.youtube.com/user/MrDelcol#play/uploads
hd vids
http://www.youtube.com/user/topasassin#play/uploads
http://www.vimeo.com/user2514116/videos
BasqueRoad: Pyrenees Road Cycling Holidays
Sounds like a recipe for disaster when you say it like that lol.