I cannot speak on every single one of Washington's actions towards Congress, but I will say that they loved the man and looked to him and his cabinet for much leadership. In the first few years of the Constitution, there was great infighting between the Federalists and Democratic-Republicans, kind of like the political parties of today, but they both shut up and listened to the impartial Washington.

This really illustrates just how much power Washington had- many of his executive actions were simply allowed to slide in comparison to other presidents who would've seemed suspicious. (For instance, executive privilege was first developed by Washington, when he refused to show the House of Representatives the documents relating to Jay Treaty. The House wasn't happy about it, but they allowed it- indicating just how much room they gave Washington)

If there was a single party that was dominant in the government, it was the Federalists, many of whom advised Washington very closely- the most prominent example was Hamilton, who convinced Washington of his economic plans and Bank of the US idea. Jefferson's Democratic Republicans didn't have as much influence until the turn of the century.