I'm not from your area but find that generally speaking the big name hills do tend to attract a larger group trying to be instructors, and hopefully a better crop to pick from. They do rate them and will pair you up with somebody based on your experience and needs (at least they should).
I know at some of my local resorts they pair you up based on a 1-5 rating of your abilities. With 1 being barely able to stand up/never done it, 3 is comfortably linking turns, running a mix of green and blues, no blacks, 5 being all out jumping off cliffs, major park tricks, glades, etc.
Oh and don't worry about taking lots of lessons. I met a instructors instructor out here in Calgary who tried talking me into getting a high end lesson. I was a little insulted at first (I've been boarding 19 years and used to race, and this guy didn't know anything about me). But then I got to thinking that it'd be nice to have somebody actually watching me ride who could offer some pointers or even just show me where the hidden sweet spots on the hill were. I still haven't done it yet but may do a lesson this year for the first time since 1992!!!