vimtutor was all it took for me and didn't take that long. Yes, it takes about 30 minutes to get through, but I used it off and on as a refresher as I was getting more accustomed to using vim. Here I am half a year later I do almost all of my text editing using GVim. My advice would be to gradually ease into the advanced commands and plugins and not to immediately try and fix every problem you come across where vim doesn't behave like you would expect coming from other editors.