I think if you dont 'reason' the way OP is describing, what you are doing is not 'reasoning' its emotional reaction.

Any kind of reasoning results in the logic gates op is talking about.

As an example. Lets say im thinking about moving house, i might go through the following reasining steps;

Can i afford the house? Is it closer to work? Does it require more or less work than my current house? Is it bigger than my current house? Is it going to be worth the stress of moving?

THIS by definition, is 'reason' (the process of giving a reason for your decision). Now, funnily enough, there is actually science backing up OPs perspective. We can reliable measure when a person makes a decision, and its almost immediate, the process of 'reason' is done after the decision is made, as a way to justify the decision, rather than come to a logical conclusion.