There are some languages that almost require an IDE to be usable, such as Java or Visual-anything. I have yet to hear of a good Java dev who could work without the IDE to manage all the crap he needed to write in order to be useful.

The point I'm attempting to make here is that the languages all the smart people I know prefer to work in don't have "features" that require the use of an IDE. And, before you say "OO languages require IDEs", merlyn loves Smalltalk and, AFAIK, he doesn't use an IDE, either.