@Scrbblchick -- I had to laugh at your post. I can respect honesty. I can make a tasty veggie version that does cut down on the fat and calories quite a bit, and if you're really concerned about your diet, I'd recommend it, but if, as you said, you're only eating it once a year, then go for it.
Frito pie is just one of those dishes that works. Every element is tasty on its own, but still complements all the other elements when they are added. I like using chopped green onions in my recipe, along with refried beans. That adds a hearty aspect if you're not using meat.