That's just it. In my company there are basically three sets of developers. The very experienced ones prefer vim/emacs. The experienced ones tend to like these

That's just it. In my company there are basically three sets of developers. The very experienced ones prefer vim/emacs. The experienced ones tend to like these more established IDEs, and the younger developers absolutely hate these IDEs and find them to be slow and bloated. I can't really comment on whether they are good or not since from my perspective I see people who are productive and unproductive using both of these tools, so to me it just looks like mostly a matter of preference. But newer developers don't seem to like these established IDEs and see them as you said: big, slow and laggy.