"I Feel..." (Or do I?)

Last night in Dale Carnegie the focus was on overcoming arguments and then learning techniques to agree to disagree with others.   There was discussion on avoiding words such as "but," "however," and "nevertheless" when in conflict with someone. ("I hear what you're saying, BUT...")

Instead, the benefit of using phrases such as "I think," "I feel," and "I believe" were discussed. For example, someone says something you disagree with. You come back with. "You raise a good point. I believe ..."

I remember reading quite a few business books that advise people--especially women--to avoid using the "I think, I feel, I believe" phrases because these phrases make you appear indecisive and/or weak.

Here's my question--do you agree? Admittedly, those business texts I'm referring to were books I read years ago.  Is it true the new "Emotional Intelligence" indexes encourage rather than discourage the use of these phrases in business?

Not a life or death question, but still kind of interesting. Would love to hear people's thoughts on the matter.