Having been using Growl for years, I mechanically went to buy it on the Mac App Store when 1.3 was released. To make sure the upgrade was clean, I first uninstalled the 1.2.2 version I had on my system… only to realized I could not install the new version, since I am still running Snow Leopard.
I did not reinstall Growl, and I am very happy with my system as it is. I had already disabled some notifications before, such as Adium messages showing up on my screen, but I still had some, like the name of the new song playing. All this noise is now removed and it is great.
I can see how Growl can have its uses though. Sometimes, you need to wait for a long process to finish in order to perform the next action (e.g. wait for a long download, deployment, or software build). Or for alerts of a monitoring system, where you would really like to be interrupted. I may reinstall it when I have such use cases, but enabling only the minimum number of notifications.
(Update: FWIW, I believe the parent read "people enjoy being notified", with no 'not', when I wrote this. Not sure if I misread or it was modified.)
Your strawberries are ready to be harvested!
Notifications let me know what's going on right up front (and if I don't want to be distracted, I can always close my email completely).
I'm all for turning off “iTunes changed song”-type notifications.
Most of these are not even enabled by default (Mail and iTunes are not growl-enabled so you need to enable a separate addon to handle them), and are trivial to disable (a checkbox in the Growl preference pane)
If that is your "biggest productivity gain" as an OSX user, I'm sorry to say you're just an idiot.
You can't strive for a higher standard when there is no higher standard to strive for: sometimes, a person is being an idiot and refusing to use the right word is just misplaced political correctness.