Yes they did. Their intent was that the most important offices in government couldn't be filled by the rule of "the mob" (and even in the information age, so far it has worked here). And amazingly enough, just a few years after the US Constitution was adopted, the world saw what "the mob" did in the Reign of Terror in France.Do you really want the President to be elected by maybe 5 highly populated states?
There would be a limited number of states candidates would campaign in, and none of the states would be named New Hampshire, Iowa, Utah, etc. The founding fathers knew exactly what they were doing with the electoral college.