Actually they gave us quite a say. We elect the president who appoints, and the senators who confirm.
They gave us a lot of indirect say about a lot of things, but were very careful to make sure it was indirect.
People keep saying to vote for platform. Funny that the founding fathers chose to give us a representative, rather than direct democracy. They strictly limited our ability to enact legislation as the people, and saw fit for us to elect candidates to then legislate.
Then there's "it's about the supreme court". The founding fathers thought there needed to be an extra layer of representation there, not only insulating the people from deciding how law should be interpreted, but causing us to elect people who would in turn fill the supreme court.
It's interesting that some of the same camp who shout "The constitution!" all the time seem to yearn for a shortcut around the layers that it puts in place to keep the fickle will of the people from causing the government to go wildly lurching around.
I think the control of the Senate is actually more important that who becomes president.
There definitely seems to be a delusion on the part of many that once the election is over whoever is president will suddenly enact all their heart's desire. Depends a lot on their relationship with Congress.