Racers, those who climb mountains, and fools need clipless pedals. Even in those circumstances, the verb "need" is debatable.. But I digress..
Try cycling with platform pedals. Your efficiency won't decline noticably, you'll be FAR safer, and you'll enjoy your new bike even more! Just try it.
I guess one of the things I enjoy about bicycling (and most activities) is learning the more advanced skills - simply how I am. If I have a computer, I like to learn and practice all I can, as much as I can. If I have a bike, I like to ride it in the way that the more advanced riders ride.
I guess this is simply personal preference, and I don't feel that I am a "fool" because I do this. And besides, I enjoy riding clipless.