[raverbashing]

Yes

About hummingbird, it's amazing. Really, I found it strange in the first minute. Then I got it

Why? My major peeve with traditional notation is the lines above and below. And I never know what are they talking about after adding some lines above the stave.

About the key signature, 100% agree.

As pretty much all students, I thought the key signature just meant which notes are always sharp or flat ("oh these guys want us to use more black keys - BORING")

It took me some time to get it. It's not about flat or sharp, but as they said it, it's 'G Major mode'. Then you feel everything is clearer. It's like going from understanding words in a phrase to understanding the phrase.