I had the first 2 generations of the 12.9, but when the 11“ iPP came out, I grabbed it up. Having a Mac I didn’t really need the larger pro.
I wound up selling my M1 iMac because I realized I rarely turned it on, so I wanted to go larger on the iPad for the desk. It just so happened my sister-in-law wanted an 11” pro, so I sold my pro and all accessories to her a couple months ago, and got another 12.9.
For the desk it’s perfect for me. I love the larger MK for typing, and the screen is great. With the MK, I find it pretty easy to use in my lap as well. It’s a bit much for me to have lying on the couch or in bed so I wind up using my phone most of the time in that situation (To be fair, I rarely used my 11” pro in those situations either).
I’ve been trying to decide if I want to get a mini for that, OR just go to a max phone this fall, but I won’t be giving up my 12.9 pro.