I have been using Idea since 4.5 (and upgrading afterwards).
Some random toughts:
1) Quality vs features:
Version 4.5 was full of quality (stability, speed...) while later versions (7 included ) have been a swing in other direction. What about taking a pause in features (after all, we have plugins) and getting back to the fast, stable, IDE we had?
2) The Real competion
To all the plugins kids hanging around, the real competition is not Eclipse, which is crawling under its own structure, but NetBeans (admittedly, version 5.5 onward). The NB 6.x stream (rc status) is really similar to Idea for the IDE and for concepts, so people (like me) hating perspectives and plugin (dis)integration are more likely to look at NetBeans than eclipse. Try some of the shorctus of Idea in NB 6....
3) Crazy idea
What about an emulating layer on top of Plugin API to make NB plugins compatible with Idea ?