There are many IDE's out there that have this precise feature. The idea is to save keystrokes while editing code. When you put in an open parenthesis, you always need a close... so, the IDE adds the close for you. I'll admit, on the upgrade, it took me a while to get used to as well. But I've found it very helpful to make sure that I always close every string, parent, function brace, etc.
While I understand it would be nice to turn it off, it might just be a matter of being familiar with a new way for the editor to function. Feel free to Kudo adding the option to turn it off... but for me, I've gotten comfortable with it and it's really a rather nice feature.