Wow, so much hate in here. You people are like horrible old women.
I for one like the new UX a lot. My biggest gripe with 29.0 is probably the Google Chrome "hamburger style" menu icon and the round back button, which can probably both be fixed with add-ons.
"Spontaneous disintegration" is EXACTLY what "Spontaneous disintegration" means. Look up Comet LINEAR, for example. It disintegrated in August 2006 for no apparent reason, since it was not passing near the Sun or a planet when it broke apart.