As many others have mentioned, it doesn't have to be all or nothing to make good use of Vim. I use vim-mode-plus in Atom, and it works great for me (though I wouldn't say by any stretch that I'm a vim power user). I use it in the areas that I feel it makes me a bit faster and more productive.
I do want to point out one other reason that makes it useful to learn Vim (modes and keybindings): Working on different machines, or VMs, where your favorite editor is not necessarily readily available, or GUI-less servers. For basic text editing it has been invaluable to learn to use Vim to do quick edits (at least for *nix machines).
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