I fon't much like UEFI either...
(but that's because my new tablet machine, 64 bit atom was shipped with a 32 bit UEFI implementation, windows 8.1 pre-installed, running in 32 bit mode, an whilst you can get 32bit Linux boot efi boots, all distros seemingly don't bother to ship them. - which is making dual booting, (or triple booting as it'll end up) a stupidly hard nightmare of a task!
it doesn't add fancy graphics in all cases.
what it does do (in some cases) is make it pretty, (but then I had an old compaq 20 years ago where you could use a mouse in a BIOS)
it can enable secure boot (meaning code has to be signed to work - stopping viruses writing to the boot sectors to load before windows does making them all but impossible to remove.
it can address very large disks, (which old BIOS's couldn't)...
it shouldn't stop you doing anything...
but as above, it might if you're unlucky.