After trying them and seeing how they've been improved over the past few years, my opinion has changed. There are at least 10 different models from which to choose, and most of them are good for about 30 to 40 rounds of golf before having to be replaced. You may not like having to wear them, but I think they're here to stay. So you may as well accept it, find the nonmetal spike that suits you the best, and I think you'll find that it won't affect your balance at all. As I mentioned above, your shoes should not affect the balance in your swing.
Loss of balance is caused by improper swing technique and poor tempo.
This usually happens when the upper body moves faster than the lower body. There's a tendency for the player to swing hard with the arms and hands to create more club head speed. However, this results in the club head reaching impact slightly before the weight has a chance to plant completely into the front foot. With the weight in transition at impact, the force of the club head will tend to cause the player to lose balance and tip forward over the toes. Here's a drill which will help with both balance and tempo.