Man, the universe is pretty, um, big
* Number of superclusters in the visible universe = 10 million
* Number of galaxy groups in the visible universe = 25 billion
* Number of large galaxies in the visible universe = 350 billion
* Number of dwarf galaxies in the visible universe = 3.5 trillion
* Number of stars in the visible universe = 30 billion trillion (30,000,000,000,000,000,000,000)
So if intelligent life exists around one in a trillion stars (0.0000000001 percent of stars), then there are 30 billion planets with intelligent life in the universe. Is one in a trillion still overestimating the likelihood of intelligent life?
By the way, check out that site -- the map of the large scale structure of the universe is worth the price of admission.