My 2¢:
Growl is useful for various notifications that I otherwise wouldn't get. But what
I find intrusive was Little Snitch!
I have re-installed it many times...about every seven months when I forgot that I trashed it seven months before! Perhaps if I paid for it and ran it for a few weeks, it would stop asking for my permission to allow stuff to work. Does it have a 'learning' period?
It really gets annoying and slows me down to keep getting requests which often don't provide any real help in determining whether the access should be "Once", "Till Shutdown", "Forever" or until I can't stand the app any longer!
Since I don't touch type, I'm not looking at the screen that much (I need to look at the keyboard to make sure the letters are still where their supposed to be...), but I know when Little Snitch 'warns' me about something because then my typing becomes nothing but a series of 'beep, beep, beep...'
Then, I have to stop what I'm doing, look at the screen/read the dialog/decide which buttons and/or tabs to use/clear the dialog. Growl is nothing like that, you can view them or just ignore them, they will disappear on their own after the time period you choose. And, I think it's free.
So, what does MacJournal do for you, I've never used it. I thought it was a 'writers aid' thang!