Yes, there's an official IdeaVim plugin [1]. I'm not sure how deep the rabbit hole goes, I just use it for basic vim goodness, and shy away from advanced stuff. But sure, modal editing, movements, macros, search, etc, are all there.

[1] https://plugins.jetbrains.com/plugin/164-ideavim

There is a (or more than one?) Vim plugin with fairly good support. However, it is not Vim. Most of the common Vim operations work but others are broken.

For example, I've found the weirdest bugs when using visual block, especially in column mode. It just completely mangles everything.

Yes, it has a vim emulator, ideavim. It's far from perfect, but I would say it's better than most.

https://github.com/JetBrains/ideavim

Yeah, one of the most popular plugins changes the input scheme to be very similar, if not identical, to vim.

Yeah there's a vim plugin https://plugins.jetbrains.com/plugin/164-ideavim

Yes, but it's way slower and you can only open one project at a time due to it using all if your ram