The Lancaster, PA costco has parking spaces with hitching posts for buggy parking.
The Amish are not anti-technology; far from it; look at the lighting systems used on the buggies. They are often early adopters of technology, but the specifically shun tech that doesn't fit into the culture that they are trying to maintain.
A big part of why gas prices hurt so much now is that we've made life and job choices based upon cheap gas. The 'ideal' gas mileage (trade-off between performance, capacity, efficiency), the 'ideal' place to live (commute distance), the ideal amount of home insulation, etc. all change with fuel costs. In many ways, the Amish act as though externally supplied fuel is very expensive. It would be an interesting experiment to live for a month as if fuel were $10 or $20 per gallon.
-Jon