I started the survey but aborted.
As a longstanding commercial farm with hundreds of sheep and 30+ breeding cattle, and a very good and communicative vet, we would be unlikely to use FECs unless we had a problem that wasn't succumbing to medication on vet's advice.
We also get lab reports on lambs sent deadweight, which is a valuable resource to us, provided by the buyer/slaughterer. We've had early indication of summer fluke and of unusually high lungworm burden this way. (Neither of which condition would have showed up on a routine FEC, by the way.)