People tend to forget what a blessing Flash was when it first arrived on the web, how horrible other plugins were, like the awful Java mess. Everytime a Java-applet tried to run, you could only pray it wouldn't crash your browser and take your whole system down. Or the terrible experience called RealPlayer!
Sure, Flash has a bad security reputation, for good reason, but it made the web more beautiful, interactive,fun and usable at the beginning of the new century. All you had to do was click on "Skip website intro".
I haven't forgotten. Even today, creating dynamic apps in flex using xml and actionscript is easier, more performant and saner than using HTML5. If only the flash player wasn't a minefield of bugs and security vulnerabilities. :(