First, welcome to the DIS Boards. This is a great place to ask questions about WDW.
In answer to your question, yes anybody can eat at the resort restaurants. Frankly, I encourage you to do so. There are many fine one's to choose from, and its' a great way to see the inside of a resort at the same time. Some of our favorate ones are Artist Point at WL, 1900 Park Fair at GF, Ohana's at the Poly, or Chef Mickey's at CR. There are obviously many more to choose from. I'd pick a couple and try them.