The first time my company did a survey was about 15 years ago. The biggest "change" which arose as a result of the survey was a company picnic. Woo hoo!

That lasted 3 years before being cut from the budget. Future surveys have yielded absolutely nothing in the way of results. I know this because there was no follow-up from the company. And I made a lot of good suggestions (anonymously, of course

), none of which were acknowledged in any fashion.
For a while HR had a program where we could submit suggestions, and if the suggestion was approved by the "committee" and implemented they would reward the person monetarily, depending upon the costs savings, added revenue, or improved work environment resulting from the suggestion......up to a cap of
$250,000. I won $250 once, and Uncle Sam took half of it. Another suggestion which I submitted (and which would have resulted in millions in added revenue) was summarily dismissed. This program was cut from the budget after about 5 years.
The better method of soliciting employee opinions is to foster an environment where everybody feels appreciated, and therefore feels comfortable making suggestions which would enhance the work environment. And the management has to be open with the employees, and committed to making the company a great place to work. It's the only way to build trust.