First of all, UEFI is more than Secure Boot. UEFI has been standard on PCs for the past few years, and on Macs ever since they switched to x86. Secure Boot is just a feature of some newer UEFI implementations.
Second, Secure Boot is a legitimate security feature that helps to protect against boot-time malware. There's nothing inherently evil about it. The controversy is over who should have the power to decide which OS is considered trustworthy and allowed to boot: the owner of the computer, or the vendor of the OS that came preinstalled on the computer?
Naturally, you don't want to buy a computer that doesn't let you choose which OS you trust. But if you have a computer that does give you that choice, why not take advantage of it? Seems to me that it's good to have hardware vendors see increased demand for machines that support securely booting the OS of your choice, as opposed to those where you just have to disable Secure Boot entirely if you want to run something other than Windows.