If you consider the transition from macOS 15 to 26+ 'small', I think you should see an optician.
Like GP, I despise the new design. I'll say the old design was pretty peak design. Windows looked like windows. Buttons like buttons. With accessibility tweaks (for transparency and borders) I could make it very, very usable.
This new thing is a crime against UI. Every icon now sits in a circle, and takes up % more room as a result. Because … it's pretty? It isn't pretty.
I upgraded my laptop thinking I was going to develop an app and that I'd need to be on the latest design. I ended up developing a TUI so I needn't have bothered. Every time I see my partner's laptop, still on Sequoia, I shed a little tear.