greptomania
1.) They abstract important (to me) details. For example, build system integration. I prefer to see the actual Makefile to ensure that things are being linked correctly. This is especially important on large HPC clusters where there are a plethora of compiler options.
2.) They are too graphical. Essentially all of my programming is done through the terminal, which is fast and lightweight as compared to, say, Visual Studio or XCode (or w/e the standard OS-X IDE is).
3.) They do too much to 'help' the user, which ultimately just gets in the way. This is obviously a highly personal and biased opinion on my part. However, it is important (to me) to physically type the source, rather than starting from some template with boilerplate and adapting it to my needs. This is perhaps a reflection of the poor design of many languages (e.g. Java, C++) which necessitate such quality of life 'improvements' for some. But, for me, I just want to code what I want to code without an IDE getting in the way ala the maligned Microsoft Paperclip.
While I personally prefer emacs to vim, I have no doubt that these points may be common to developers who prefer either to an IDE. To your point, I do not know (but would not be surprised) to learn that some fantastic modern IDE could do all of the above. But, why do all that when emacs works so darn well for me?
Strangely, I've not seen much on HN, or elsewhere, make mention of AMD's software support. Is this because it doesn't exist, or because compilers are less "sexy" than shiny new hardware?