It has a lot more to do with how you are treated. I don't drink soda, so free soda does nothing for me. But the fact that company I work for has those things and asks the employees what they want in the fridge is a very different experience than at a company without that concern. It starts with the snacks, but it goes all the way up to sitting down and asking what I actually want to get out of the job.

It's the difference between a company acting like you should feel lucky to have a job there, and a company acting like they are trying to keep you in your job there.