No doubt that is what you were told or how it was justified to you but you misunderstood my point.
While yes, each state gets one vote for either a Democratic or Republican candidate, even if the individual districts went to a Third Party or the Minority Wining Candidate, the Majority Winning Candidate gets the total value of the Electoral Votes in each district which is not equal among the states. That value is determined by population, and that value changes every ten years with the census. A lot can change in ten years.
You also fail to realize that, despite the Electoral College, only a few states "still determine the presidency". Mostly swing states.
Removing the Electoral College doesn't equalize the population between states, it places a value to it. It is not designed for the convenience of the voter but rather so that the candidates who are campaigning, may appeal to a moderate mass of voters and devalues the votes to states that are high in population but where a clear majority of one party's influence remains.
You could argue that this is necessary but without the Electoral College, the state population's are irrelevant. Each person's vote will carry equal weight no matter what state they're from and even if a majority holds in that State for one candidate, that other candidate still gets the individual votes from that state and may still win if they hold a majority over the entire country.
Without the Electoral College:
Say you're from a Blue State, there may even be 30 states that are "Blue" but you vote for the Republican candidate. If the Republican candidate wins, your vote counted. If the Democratic Candidate wins, your vote counted.
With the Electoral College:
You're still from a Blue State, the Blue States still hold majority, but you vote for the Republican candidate. If the Democratic candidate wins, your vote did not count. If the Republican Candidate wins, your vote STILL did not count.