Earlier quoted context omitted.
I absolutely want to learn VIM but saying it's only a weekend is plain misinformation. We're definitely looking at months of gradually building new habits.
I think the difference between your and the other opinion is what does "learn vim" mean? Is it enough to know how to enter insert mode, make an edit, then save and quit? That's easy enough to learn in a weekend. Or is it learn how to edit efficiently using the various vim commands? That will indeed take much longer than a weekend. (Even getting it configured just the way you want to will probably take more than a wee…
That's Notepad level usage, you don't gain anything from it.