At Packet, we've been working to support CoreOS and their Distributed Trusted Computing (https://tectonic.com/trusted-computing/) for our on-demand bare metal product. This relies on UEFI vs traditional BIOS. Reading up on this I've certainly learned a ton! A good background article I read was https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-...
Definitely recommended for someone coming from the legacy BIOS boot background, expecting UEFI to be the same. (Hint: It isn't)
Basically while legacy booting has too many black boxes and black magic (from an end-user perspective) to be practical to work with, UEFI is actually inspectable and debuggable. If something fails, you can figure out why.
Best of all: Creating live USBs/CDs/whatever no longer requires special tools. Just copy the everything, including the EFI folder, and its automatically bootable.
UEFI is awesome.