I am not sure whether you already have one, but if not then do check it out in the Apple Store first - I was convinced I would find the weight difference quite significant, but on picking it up I found it to still be a fairly hefty device compared to, say, an iPad Mini or Kindle.
The thinness is noticeable if outside of a case, but it still has the same sharp edges of the 2018 model, so the 'hand feel' was quite similar. Visually the thinness is quite striking though.
Very good machines, but just not quite the revolution I had hoped for.