Originally posted by: dullard
Most people use way too much soap since it doesn't lather enough for them. When you have a water softener it lathers more, and thus many people use less. Lather is the worst judge of how much soap to use. If you go by the amount of lather, then either (a) use less knowing lather is unimportant or (b) get a water softener. But really, if the cost of soap is a critical factor in your budget, you have bigger problems to tackle and probably cannot afford the $3 a year of salt to run the water softener.
I don't think you really have to worry about your pipes or clothes. Yes buildup can be a problem, but I think it is fairly rare and minimal.
The main difference is just whether you like the feeling of a hard water shower or a soft water shower. I personally think a hard water shower makes me feel completely different than a soft water shower. It is hard to put in words the exact difference. You'll just feel it once you try it out. You may or may not like the difference.