Off hand do you know what section states that? I'm aware of the exception to the 1000' rule for permit/license holders. Though I don't remember seeing anywhere that states you have to conceal, only that you have to hold a state issued permit.
Google map [city name] + "school". There's not a whole lot of anywhere that is not 1000' from some sort of "school".
Here in Colorado Springs, there are 142 schools which meet the GFSZA's requirements. Given the average acreage of a school, and adding 1,000' around it, then multiplying that times 142, gives us a square milage that comes to just a tad over 10% of the square milage of Colorado Springs as a whole. Thus, 90% of Colorado Springs is beyond that 1,000' border.
However, people don't stand still! We walk around, and if were to walk from any random point in Colorado Springs to another point 1 mile distant, chances are greater than 50% that I'd cross one of those borders. Thus, I have no problem driving to/from a restaurant, for example, for when I park, I'm doing so in their parking lot, and that's private property. Any time I head to an outdoor event, however, I Google map it and search diligently for schools. If they're within 1,500', I CC. If in doubt, I CC. If I can't find the information, I CC.
Another example was an event my wife and I took my kids to at a local elementary school. I kept my weapon locked in the glove box. Partway through my wife wanted to go get a Starbucks but she couldn't. If she returned to the school with the weapon in the vehicle without a CCW, she would be breaking the 1000' rule. Even though we arrived together, and it was my vehicle, if she got pulled over turning into the parking lot for neglecting to signal or something, she'd be in a whole world of trouble by driving onto the property of the school.
If you were in the vehicle and had your CHP (that's what it's called here in Colorado, not "CCW"), you'd have been legal to drive onto school property. Federal law doesn't specify either vehicle ownership or who's driving. It simply states that possessing a firearm within 1,000' of a school is legal with a concealed carry permit. Colorado law allows you to drive onto school property provided the firearm remains in the vehicle and in a compartment. The vehicle must remain locked, but there's no requirement for locking the vehicle.
The problems associated with the GFSZA are many, and serious. There's another thread on this forum which specifically deals with a bill introduced in 2011 to repeal the act. More on the problems,
here.