I don't see anything shameful about using old software if it works well and suits your needs. Yes, new editors like SublimeText have advantages, and if you prefer them over Vim, use them. However, I've seen many projects undergo a rewrite in order to move to new technology, but they never matched the utility of the old technology they were trying to replace. I'm not saying it can't happen, but that it often doesn't.
I don't use Vim much now because I work a lot in Windows, and Vim got me into the habit of hitting escape when I was through entering text, but escape cancels the input in a lot of programs. However, I still use it in the shell or when I need to make certain global edits.
I wish Neovim great success, and I might use it someday if it meets my needs, but not just because it's new technology.