I do, and I also used my 2018 12.9" until this one without it. However, I did preorder the new Brydge keyboard/trackpad thing which is supposed to ship later this month to try it out. I like that it looks like a little MacBook Pro, but has the magnetic cover so I can just pop it out and into the slim magnetic Apple case.
I didn't use the keyboard before now because I mainly used it for web browsing, YouTube, editing photos in Lightroom, and drawing. But also because mouse support didn't even exist when I first got my 2018 12.9". Furthermore, the Magic Keyboard is really expensive, wobbly, and has a tiny trackpad. The new Brydge keyboard is $100 cheaper, looks more solid in a lap, has a row of function keys, has backlit keys, has larger key travel, and has a large trackpad that supposedly really good. It also attaches magnetically instead of using those stupid little grippy bits they used to use that can scratch up the iPad and leaves it unprotected on the rear. I'm looking forward to trying it out!