I touchtype at around 90WPM on a keyboard and swipe/glide typing (which obviously relies heavily on autocorrect) is the only thing that makes inputting text on a smartphone somewhat almost bearable for me. Otherwise I feel like I'm trying to type with mittens while drunk.

It's reasonably fast, I don't have to aim for tiny boxes with my fat fingers and it takes care of accents when I type in french. The correction algorithm is also getting better (albeit still far from perfect); sometimes it'll correct the previous word based on what I enter next. If you want me to disable this you'll have to give me a full size keyboard as a replacement.