I like the Plaza more than Skippers, and feel they are both good in their own way. I ate at the Plaza before my MVMCP a couple of weeks ago and the food was excellent. They are just very different. Skippers is a little more adventurous and Plaza is more comfort food. We haven’t had a bad experience at either one.
But I would point out the secret menu is WDW's worst-kept secret. Our server has offered it without prompting on every visit. And why wouldn't they? I mean, why keep it a secret when you can sell more apps by publicizing it?