I almost had a heart attack after trying to find this addon in blender 4.3 and can't find it. It's sad it's no longer build-in add-on inside blender. Good thing it's so easy to install. I use blender as architecture so getting accurate and able to show measurement is so important to me.
It takes some time to get used to the MeasureIt workflow but once you understand it you get everything it promises to deliver. Excellent work!
Saved me from going insane because blender is only able to show selected edge lengths.