A lazy Lead could very well take readings and walk around and not do much in general. And indeed there are some lazy Leads. It takes a lot working together to make things happen correctly, and a restaurant at Disneyland is more than just a theme park version of a normal restaurant. Like all CM's, you represent the larger theme park. Prices get complained about more, because they are perceived as unfairly high.
Image is much more important inside the berm than outside.
In short, it's a challenging job. That someone is the Lead. I haven't even touched upon the Lead's role as a sort of go-between representing the CM's to the managers and vice versa. Leads do a lot. Yet, Disneyland for a time in the 1990s took away Attractions Leads.