When I was in high school, my class was the first one where everyone receive laptops and the teachers were pushed to incorporate the laptops into the curriculum. It was a giant distraction and students were surfing the web and playing emulators instead of actually learning. And it is still exactly like that!
Teachers rely on technology because it makes things easier for them as teachers. This doesn't always mean that it makes things easier for the students. Ultimately, the kids just need to learn. This can be done with technology, or without. Math and English do not change because a child has a computer.
In richer school rooms, there may be a tendency to rely on the latest technology in the classroom. It is probably a good thing. The world is changing fast and the kids should learn to adapt. The real concern is for school districts that can't afford the technology. It is these kids that will be left behind yet again.
No, teachers don't rely too much on technology. While some teachers may use technology simply to use it, there will be a benefit in the end. Technology is still new to some teachers and they are looking for ways to use it in the lessons they're used to. Technology is a very real and very prevalent part of life. It needs to be used in schools to prepare students for life.