Let's face it, the only reason people are coming to Lancaster, besides seeing spectacular countryside, is to see the Amish. Amish country isn't a zoo; the Amish people live, work and interact with the local "English" in, for the most part, harmony. Keep that in mind when you stop to take their pictures or just gawk as they roll by in buggies. They're people too.
There is a lot of myth and mystery around the Amish. Its interesting to keep in mind that you don't really become Amish until you are 18, when young adults get accepted into the church. Until that time, the youth are free to do the things that other teenagers do: drive cars, stay out until 4 in the morning, etc.
Their "rules" are often confusing too. Each bishop makes his community's rules, therefore some are more strict than others. It is true, they shun all things electric - but a generator-run refrigerator in the house is okay. Yes, in some cases, cell phones are okay. Kids are often seen on rollerblades.
Another myth is that they shun the English. This isn't true: the local Amish do business with the community and interact just as anyone would. They sometimes rely on the local "English" to, say, drive them somewhere, or to visit a doctor.
When you come to Lancaster, begin your trip at one of the house and farm attractions to learn more. The Amish Farm and House on Route 30 is a good place to start a days' visit. Open from 8 to 5 pm, they offer a guided tour through a typical Amish house, then you are free to explore the farm, buy crafts or sample some food. The gift shop here is actually quite nice. They have foreign language guides on certain days.