We stayed on site and toured IoA and US one day each. The Unlimitted Express Pass allowed us to tour as much as we wanted for all of the participating rides with little to no waiting. We saw all we wanted to in one day using the Pass. With out it, I doubt we would be able to see all we wanted to due to the crowds.
I am not sure what the crowd levels will be for your trip, Tues after Easter. The Express Pass saved us tons of time in line, during July a very crowded month.