I like the idea of the "greenie" but, since I do very little new construction on anything smaller than a small factory, for me, they're a waste of money.
I also don't believe in crimping.
I was always trained that a crimped slice is not ideal for solid wires and on almost every crimped ground splice I have come across, there is atleast one wire that seems too loose to be a healthy connection.
For me, a properly sized wire nut has always been the method of choice.
As for daisy chaining grounds across devices, I don't mind it and it leaves atleast one less wire in the splice.