Armstrong said it "wasn't a good idea" and complained about German fans, saying they were "horrible."
It was the first time that Tour organizers ran a time trial on the legendary climb.
"I don't think it's safe," Armstrong said.
Others enjoyed it.
"It was cool ... amazing with all the people on the hill," said American Christian Vandevelde of the Liberty Seguros team. "You'll probably never get this chance again. Who gets to be in front of a million people? Not even NFL players. Nothing compares to it."
Australian sprinter Stuart O'Grady was not troubled by the proximity of the fans.
"I had a lot of German and Dutch fans offering me beer," he said. "I'd love to have stopped for one. Maybe next time."
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