It does! I got it to work recently :3 you have to make a new option somewhere, I don't have access to my computer atm, so I sadly can't show you, but I found a guide how to activate it on google! You might have to search a bit though... But it's there somewhere!
I've tried Paint Tool SAI and Photoshop, but I think I'll always prefer GIMP! Although I do wish you could have different sizes on different tools in the latest version, it's a bit annoying when you need, say, a big brush and a small eraser so you have to change the tool sizes.
It is pretty annoying, but the GIMP devs have done this for tablet users, at least. (I have used GIMP with my Intuos Pen and Touch for months, it supports everything nicely!) Both the pen and eraser have their own tool settings/sizes separate from each other, as well as the mouse too. So you can have three pointing devices setup for difference tasks.
GIMP was already great with a mouse, but it's ten times better with an art tablet. I felt like I was taking my digital art to the next level after I got one.