You can just leave Flash uninstalled and download Google Chrome. Chrome has it's own bundled version of flash, so any time you absolutely need to use it you can. It's actually better than using a Flash blocker because it lets websites know that there is no Flash installed. Some sites will serve you alternate content if no Flash is detected. When you use click2flash etc, the website still thinks you want Flash content and tries to serve it to you regardless. It's not as user friendly, but i've got an Automator action that opens the current safari URL in chrome via a keyboard shortcut.