I don't think this was the largest attendance numbers but I could be wrong. I know that the main show floors were at least as crowded as some of the busiest years from the recent past before the recession took its toll.
2012 CES Grows, Excites and Catalyzes
Executives from business, government, entertainment, automotive, consumer electronics and every major industry converged on the 2012 International CES to experience new ways of doing business at the world's largest consumer technology tradeshow. Owned and produced by the Consumer Electronics Association (CEA®), the 2012 International CES concluded today in Las Vegas, Nevada.
The 2012 International CES was the largest in the event's 44 year history, with a record number of more than 3,100 exhibitors across the largest show floor in CES history – 1.861 million net square feet of exhibit space – and drawing a record of more than 153,000 attendees, including more than 34,000 international attendees. More than 20,000 new products were launched at the 2012 CES, which also featured top executives participating in keynote sessions, including those from Qualcomm, Mercedes, Wal-Mart, Intel, Ford, Verizon, Unilver, Ford, eBay, GE, Google and Facebook. Executive delegations from thousands of global companies, from Apple to Zeo, attended the 2012 CES to meet with current and future customers.