Wait, I thought QuiGon said "it's through the midiclhlorians we can communicatwe with the force." My take on it was that the midichlorians actually had nothing to do with the Force, they are simply a doorway, a communication system by which someone is able to access the Force.
Yes, the more midichlorians you might have, the (for lack of a better way to put it) bigger opening you have for accessing it's powers. They are just a tool through which you can communicate with the Force. They are not the actual Force itself.
I always thought of them as like this "telephone" to the Force. But think of the Force itself as being another language. Anyone can use the phone but in order to talk to this Force in it's own language, it takes training and knowledge. That's how someone becomes more powerful with the Force, through training, knowledge, and practice.
Anyway, that's how I've always looked at it.