IDEs exist to allow teams or entire divisions to hit the ground running with development, with a standard interface that everybody on the same team uses (a huge boon for collaboration), without a lot of time spent configuring or integrating the tools. All the integration is done by the vendor, often better than you can do it; the debugger integration in full-fat Visual Studio is still second to none.
Grooming a personal .emacs or .vimrc is fine if you're working alone, but when you're on a team of professionals working on an application built on a commercial platform, a standard workflow for development is essential and an IDE supplies all the tools, integrations, and conventions to cover the basics of such a standard. Do not underestimate their value.
I don’t mind IDE per se, Just like I don’t mind Game Consoles. It can be truly useful, as you say, to have something Plug-and-Play to hit the ground running.
But they often use subpar components (code editors, file managements, VCS,..). They are tailored to a specific standard and any deviation to that standard result in a lot of pain. So I much prefer documented tooling subset that can be integrated however you want than an IDE.
Also you usually spend more time using a system than learning it. Aiming thing to beginners increase longterm discomfort.