I hear ya, I loved the button shortcuts and used the S Pen regularly with the Note series, but that was when the S Pen was easy accessible with the built-in slot. It was quick and easy to pop out the S Pen on the Note8/10 and quickly jot a sticky note. It felt very natural to do. But on the Fold the S Pen is on the back and it's just not as natural to pull out for use, and the larger inner screen negates the type of precision needed by the S Pen to copy/paste stuff.
I'm able to do a lot of my multitasking stuff on the Fold without the S Pen, except for actual writing. That said, I do feel the S Pen "completes" the package.