Two things that do not "just work" first drove me away from Eclipse:

a) git integration. Egit is bad and barely functional. I ended up abandoning it and doing all my git interaction at the command line. I rarely need the git command line with IDEA. b) Maven integration. We use a custom Maven setup that I could never get Eclipse to work properly with; it insisted on using a stock setup that could not build our projects. IDEA's Maven support just works; I run the Maven goal from the sidebar and it runs in IDEA just like I typed "mvn <rule>" at the command line.

I still use Eclipse for C and C++ development, but I will probably abandon it for even that soon. I have just never been able to get into Code::Blocks.