It's a bit deceiving, if comparing my original SE or even my 4s just with my eyes looking at them the size isn't that much different. It's when you have it in your hand and actually use it is when you really notice.Did you really feel the size different was big going from the original SE? I was at apple store recently and when i looked at the 13 mini and the 13, I was a bit shocked at how small the mini was. Such that the 13 didn't feel that big etc.
The thing was holding the new SE at the apple store did not feel that comfortable compared to the 13 mini or the 13.
Granted it's a full screen on the mini but trying to reach the top of the screen isn't possible with my thumb.
Since turning on the reachability setting and the keyboard shift back to being usable one handed and happy that it's portable enough to put in a pocket yet the screen is so much larger.