I don't think anybody can be a "veteran of coasters". Every single ride is unique and can give you a different experience. I think people can only be veterans of specific coasters, not coasters as a whole. People who have ridden a certain ride on it's good and bad days, in all different seats, time of day, weather, etc. could safely be considered veterans. It boils down to what many people have been debating recently: you just can't judge a ride until you've actually gotten on it yourself.
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Joshua Wilcox