Honestly, the only E-stops I like are ones that are used to control the machine. If you stop with the E-stop like a switch and reset it every time, you get used to using the stop as a machine control. Then it's natural to reach for it. Not all machines are set up this way, but if the E-stop is only used for emergency stops it isn't on your radar when you need it. At that point it may as well be just another bolt head on your machine.
<and in another post>
On my mill, the stop button is used to stop the motor all the time, not just in emergencies. So in an emergency, slamming the red mushroom is the natural thing to do, because that's how the mill is stopped every time.