Apollo, slide rules and petaflops
It's worth remembering that these machines won't be flown on the missions, just used to simulate parts of the flight equipment.
The Constellation programme is still much less lavishly funded as a share of GDP than Apollo ever was; it is also far more sophisticated, being partially reusable and intended for far longer duration flights.
There simply isn't the money even in America's budget to try the 'throw everything and see what sticks' approach of the 1960s. It's worth remembering the Saturn V that took man to the Moon wasn't the only program involved - there were also Ranger, Surveyor and Lunar Orbiter doing the reconaissance, Gemini proving most of the techniques needed to fly to the Moon and the Saturn IB launcher as an intermediate technology.
Apollo was rushed, fatally so with the fire of Apollo 1 and the flight of Apollo 8 around the Moon was a huge risk undertaken to avoid the humiliation of a Soviet Zond being the first manned mission to make that journey (Zond itself was canned when its booster cracked). The Saturn V was a beast to fly and nearly shook itself to pieces on early flights and there is always the near disaster of Apollo 13 in the back of NASA's mind. They're not going to take the same risks again.
If anyone is interested in this, I can't recommend 'In the Shadow of the Moon' and 'From the Earth to the Moon' highly enough. The first is a series of interviews with many of the Apollo astronauts, the second dramatic reconstructions of the Apollo missions.