what makes you think Emacs has a high learning curve?
1. OP never mentioned VIM, so I do not see how it's relevant to compare EMACS to that - editor wars are long over ;)
2. OP asked for an alternative to EMACS for ORG-mode editing, as he obviously does not wants to use EMACS at the current time being.
Just saying that it's all so easy and making peoples issue with a complex editor like EMACS seem irrelevant or non-existing won't help anybody.
So, some alternatives to EMACS seem to be:
* for VS Code: https://github.com/vscode-org-mode/vscode-org-mode
* for vim: https://github.com/jceb/vim-orgmode
* for atom: https://atom.io/packages/organized
* sublime: https://github.com/danielmagnussons/orgmode
Also, some more information about integration can be found at: https://en.wikipedia.org/wiki/Org-mode#Integration