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It's the only VIM emulation mode I've used that isn't completely annoying. I'm including spacemacs in that assessment.

I agree, it's just Good Enough. I mostly miss some add-ons like surround.

Surround support was just added in IdeaVim 0.46. From the release notes:

Support for vim-surround commands ys, cs, ds, S, enable it with set surround in your ~/.ideavimrc

:-o Thanks!