It is an absurd assertion that the powers of the executive office have been diminished over the last 30 years. They have grown at every turn. Indeed, the executive now acts as a legislature, passing laws by executive order, and waging wars absent a legislative declaration.
Since our President is so enamoured with such a strong exective branch more resembling the powers of a monarchy, perhaps it is time to begin referring to him as King George III.
You are absolutely correct, anyone who says otherwise does not know their history. George Washington never even used his veto power while in office, because he was concerned about over-asserting his executive powers.