I (and the other programmers on my team) got fed up with the MPLAB IDE last year. We just ran into too many annoyances with it, like how it opened files from the wrong directory when we copied, say, the v2.5 directory and made a v2.6 one (though we've since switched to using subversion, which is needless to say a much better versioning system
), all of the files it generated in the code directory were annoying to sift through, and we often got mysterious "Catastrophic Errors". We find it much easier now to use a text editor with syntax highlighting, a .bat script to compile the program, a few utilities (can't live without grep), and TortoiseSVN.
So, yes, I would say I'm dissatisfied with MPLAB... Though that's in no way saying it's bad, just that I personally don't like using it.