This. The Grand Floridian has an absolutely massive quantity of lights that have burned out. Even in the strands of the hundreds (if not thousands) of lights there, there are currently so many that have burned out that it's blatantly obvious and ugly/tacky. The lights have remained burned out for years now, nothing has been done to try and replace the light bulbs. There really aren't any excuses here besides cheapness.
I'd even be satisfied with replacing lights with LED fixtures. I believe the popcorn lights on the Teacups are all LED's now for an example, they look very good and LED lighting seems to have reached the point where they're a pretty darn decent substitute for incandescent light in many cases at least (they seem to work well for popcorn lighting anyways). That would at least make it more difficult for bulbs to burn out as often as they do. But I certainly don't expect this to happen any time soon in regards to GF. If they can't even put the effort into replacing regular lights, I hardly expect them to foot the bill to replace the fixtures with LED lights. Though from what I gather, there are now actually several LED lights that have somehow burned out already on the Teacups, even though the installation of new light fixtures were installed only recently.
Kevin Yee wrote an article for MiceAge not long ago mentioning the lighting issues. His pictures actually only show a tiny part of the issue, but here's the article-
http://miceage.micechat.com/kevinyee/ky012412a.htm
It's quite well written and does indeed mention the "80%" comment Lee made in the other topic. It also shows that despite being reported by both guests and cast members to higher management, these lights remain burned out. Though he doesn't mention that these issues can and have lasted for years without replacements.