I'm like the man who fell asleep on top of the mountain and woke up to realize he was caught in a landslide. Well, imagine that man if he had woken up moments before the slide began, and could hear the ground rumbling as it began to tear away. Now, you know how I felt when I first saw some of the proposed and/or approved developments that were on Cambridge's horizon, the vanguard of over 18 million square feet of new development coming our way. If you listen carefully, you can hear the rumblings now…