I am beginning to like this plugin in its latest avatar. Hated it 2 years ago.
But please -- on any real website we need the ability to turn the caching plugin on and off.
This plugin croaks if the define('WP_CACHE', true); is left in the wp_config. Why do you care?
Use it if it exists. Don't use it when your plugin is disabled. Let me get on with it. It's highly annoying that I cannot activate/reactivate this plugin from just the WordPress screen. I have to go into the SSH and edit the stupid line.
Pls consider this tweak.