As far as VIM goes I'm on the same boat. If Webstorms VIM plugin had the ability to move from panes and specially into the file tree explorer (use the hjkl), that would probably make me want to use it.
I have "ctrl-(hjkl)" mapped using https://github.com/christoomey/vim-tmux-navigator so I have an extremely easy time navigating between splits in terminal vim. I tried like hell to get "ctrl-(hjkl)" to work in IntelliJ. I eventually gave up and decided to just start clicking the panes like a caveman. It never even crossed my mind to try the original bindings.
Thank you.