By the way, the app Pixelmator Pro has a pretty amazing Touch Bar implementation and is a strong positive-example for how the Touch Bar can cleverly assist you in your workflows if the implementation is done right. The Pixelmator team
has a good overview on their website over what one can do in the app with the Touch Bar – in essence, it allows you to select and quickly switch between all the editing modes, quickly adjust the settings for the current tool or for a selected object, gives you precise controls for straightening objects and much more.
Now all of this is of course possible without the Touch Bar aswell, but I've been impressed by how well it's implemented. For example, on a non-TB device, if I want to draw something in an image I have to select the right pencil, width, color, transparency and so on from the side bar, then draw something (with the mouse/trackpad) to see if it looks as desired, then move the mouse back to readjust the finicky menus, move it back to where I want to draw something, and so on. This can sometimes go on for one or two dozen times and it means a lot of unnecessary mouse movement across the screen back and forth for some very basic things, which is not just tiring in the fingers but
can waste quite a lot of time if you sum it up.
With my new Touch Bar MBP, I can just leave the mouse cursor at the precise point in my picture where I want to draw, and use the Touch Bar to make all the adjustments. I can essentially have one finger on the trackpad and another one on the Touch Bar during this which means a lot less finger and cursor movement. It also means that the adjustments I make immediately become visible on the mouse cursor since it's hovering over the picture all the time. This new method doesn't just make editing/drawing in Pixelmator much less tiring on the fingers but can actually save time. Much less time wasted through Fitt's law by moving the cursor back and forth in-between adjustments.
There are also some applications in Pixelmator that just
feel better with the Touch Bar than with hacking on the keyboard or moving the cursor; for example, straightening an image by moving around a precise Touch Bar scrubber just feels more natural than dragging around an on-screen slider with your mouse. But these things are of course personal taste. I also really dig the (system-wide) color selection tool for the Touch Bar that Pixelmator Pro (among many other apps like Pages) uses.
Full disclosure: I am by no means a professional artist or photographer, I'm just a student who regularly needs to make sketches, outlines, drawings and so on for his lectures and scripts.