Yup, basically, GT40. For some strange reason, people root for a candidate (like one would root for a sports team) but when your "team" wins, they do nothing for the next 4 years.
The President cannot bring forth changes on his own, he has the have the cooperation of the senate, house, and congress.
The president has "some" power. But most of the promises he makes will not occur without cooperation, and the willingness to keep his word.
That would be like me being a manager at a McDonald's telling the employees I will get them a raise. I don't have that authority if the payroll comes from the company. My promise could not be fulfilled, unless I knew how to pull strings to make it happen.