What problems is Vim solving and how is that benefiting you?
Its modal editing lends itself to lightning fast text entry, and there is a nearly infinite potential growth curve for how its various commands and shortcuts can be efficiently brought to bear in navigating and moving text around.
Through the years, various extension technologies have been added to Vi (a-la Vim) that enable it to be extended in various ways, but in my personal hard wrought experience, there are limits as to how far you can push that extension before the both the editing paradigm and the mechanics begin to creak and groan under the weight of what you're trying to accomplish.
For instance, the straw that broke the camel's back for me was trying to get IDE like method and member auto-completion and refactoring into the editor. There are various solutions for this in Vim, but they either just plain didn't work, or if they did de-stabilized my Vim installation because they required the installation of C shared libraries that were a pain to build and install. There's nothing quite like having your editor dump core in the middle of a critical editing session to make you reconsider your choice of tools. Review collected by and hosted on G2.com.