Circut Breakers Vs Fuses

For this answer, I'll refer you to Perry's website BCAE1.com under the following two titles:

http://www.bcae1.com/fuses.htm

http://www.bcae1.com/cirbrakr.htm

...in which he says

Circuit Breaker:

A circuit breaker's function is, like a fuse, to break a circuit path when a predetermined amount of current is passed. In my opinion, circuit breakers should never be used to protect electronic devices such as radios, amplifiers or crossovers. Most common circuit breakers (thermal snap action) take far too long to open the circuit path. This does not mean that they are not useful. When they are properly selected they do a good job of protecting wiring and devices such as electric motors.

But, basically, you're right...the majority of installs use fuses to protect the wiring.  But look at it like this:  you would have to be an SPL competitor to use a circuit breaker.  Any normal install should just use a fuse, and the fuse should never blow (well, almost never).  Any time a breaker opens or a fuse blows (talking proper value here), the indication is that there is a severe problem.  How many severe problems should an install have?

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.