I'm curious, what specifically works better about their IDE for you in the case of many files? Do they now have good global refactoring tools, like you can change a class name in library A and have it automatically be updated in library B and application C that depend on and use it? And without the actual files for such being open? Possibly not even the systems being loaded? (I'm reduced to what's essentially mass search-replace with https://github.com/mhinz/vim-grepper/ but it does the job and importantly helps update files I might not have open buffers for. Still a step down from what's available in JavaLand. I remember someone was working on a library to build some modern refactoring tools for Lisp but I don't know how far that's gotten.)