Yahoo was cheap/stingy/cost concious as hell. They still had a well stocked ergo team, at least for the years I was there. You'd schedule an ergo consult during new hire orientation, and you'd get a properly sized seat and your desk height adjusted if needed and etc. Lots of ergo keyboards, although I didn't see a lot of kinesis back then.

Proper ergo is a cost concious move. It helps keep your employees able to work which saves on hiring and training. It reduces medical expenses, which affects the bottom line because large companies are usually self-insured; they pay a medical insurance company only to administer the plan, not for insurance --- claims are paid from company money.