Shameless self promotion yes, but Class::Autouse has a lot of stuff for dynamically loading classes.

If your module naming scheme is purely internal you can always

use Class::Autouse;
Class::Autouse->autouse_recursive( 'Module::Root' );
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and then at any time in the code

$state->method();
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Once you have specified the module root with the autouse_recursive, it will load anything under that namespace on demand the first time a method is called.

Or if your lazy just...

use Class::Autouse qw{:superloader};

$anyclass->anymethod;
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...should work OK, but the superloader is a little bit of overkill... :)