No one is "dogging him" for asking for plans "for inspiration" because he didn't do it. That is your invention. I'll say it again, he asked "any plans laying around they want to get rid of" suggesting the actual physical plans (i.e. drawings) to build a building. That is poor place to start. We have a lot of shop layout, design, and idea threads, and they're great. Just not what this guy asked for, and frankly, if you are going to build a 28x32 shop and sink the tens of thousands of dollars to do so, and you start with a building plan then you need to be a draftsman to go from there.
Not sure if he is building it himself, or having it built. In either case you don't start with plans. My only point.
As far as the rest, I have stated a reason "why would you want to" have ceilings lower than 10'...
cost. It costs more to build a shop with 10' ceilings than 8' ceilings. Costs more to heat it too. Costs more to light it too. And guess what, that may just be part of the equation especially to a guy that has "almost" convinced his wife to let him build (unless you are going to pay the difference.) They also are more of a need in small shops (like yours) because movement of material tends to require the vertical. Not so much in a more expansive shop. My shop is 24x36, and I can easily accommodate even full sheet goods on a cart between machines. Required planning though. I would much rather have a larger footprint with 8' ceilings than a smaller one with 10' ceilings. Not that I had a choice, but would I like to have higher ceilings?...yes. Are they in any way a necessity for a very nice, functional shop?...as thousands of basement and garage converted shop users an attest...no. That said, ceiling height is just one of many issues that go into designing a shop building. All of that does not start with "plans"..it ends with "plans".