Nearly had a mini-heart attack first reading this thread. I couldn't imagine Christmas at WDW without them. They've become part of the Disney magic (yes, I fully embrace this cliche). And I may be a bit biased since Christmas time is my favorite time at WDW so taking away from it, well, I'll be having none of that... or at least I'll complain a lot about it.
The Osborne Lights were the best thing about Hollywood Studios during Christmas--no offense Hollywood Studios.
They are breathtakingly magical. Nothing beats seeing those lights...and finding the "hidden" Razorback!!