I'm a lousy one fingered typer. The main use if I had the 20 Ultra would be for this, but I think I would use it for scrolling, or most things. It was great on my only Note, the Note 3, for editing or redacting screenshots and photos, though my latest phones can do similar albeit with a clumsier finger.
On a busy Note 3 forum on AC at the time, many user's in the US loved signing checks and things, a trucker particularly - a benefit already noted (give me a break!) above.
I "noted" in a review that the aspect ratio is too slim now to use it fully, and I would agree without having tried it.
It's at this point I will always refer to my love of the pre - Android Sony Ericsson P910i (the middle child) which had a smaller pull out pen and a flexible screen material and that was the best of all for me to hit the screen keys with that was heaven. I never used the physical detachable foldable keyboard option.
Would I use all the S22 Ultra features or use the pen all the time now I've been tortured with penless on screen keyboards for so long - possibly not.
Yes maybe a fold / tablet version would be even better but more cumbersome.
Buy an S22 Ultra - it's not on my horizon but I wouldn't kick one out of bed.
There are flagship grade devices with features that I would deem as or more important at close to a third of the price, but yeh if I won a 5 figure sum I might pop in to Samsung.
Also the few big YT reviews I've watched so far were complimentary, but it didn't seem to blow anyone away. I'll watch more. Interesting that GSMArena were very positive of the Exynos variant's performance.