Am I the only one that would miss every single thing this extension hides? Actually I don't use the right side bar, but I like to organize my email in labels and auto filter emails into them and clearly see how many I have.
I do like gmail as it is now. Actually, I also like the html version https://mail.google.com/mail/ca/u/0/h/ but because it has all the features of the normal gmail but it loads faster.