Emacs gets a lot of its power from its portable customization capabilities and buffer management. It seems to me that the negative comments about Emacs are just trash talk.
IDEs, including Eclipse and VS, tend to slow editing tasks down but are okay for debugging and for visual layout tasks. Flexbuilder on the eclipse platform is nice for what it is.
VS doesn't need an Emacs-editing mode. Just use XKeyMacs. (Emacs-mode in Eclipse is a pale shadow...)
As for MS seeking out Emacs people, I haven't the foggiest!