One of the reasons I dislike IDEs is the same as the reason I dislike things like janus or oh-my-zsh, and the same reason that I removed my employer's
'source ...' from my vimrc at work. Poorly considered collections of nonsense that I don't want to be thrust into.
Furthermore, I select my plugins carefully with future-proofing as my number one priority. This means that I do not use (or at least certainly do not rely on) software that I am not confident will stick around at least until I retire or software that I could not reproduce if necessary. I am confident that Vim will stick around that long and I am confident that the plugins which I use with Vim will either continue to work, become obsolete when Vim absorbs their ideas, or are tools that I could recreate myself should future vim updates ever break them (this has not been happening so far).
In some cases, these constraints prove problematic. One example is web browsers. I have zero confidence that Firefox or Chrome will exist and/or be recognizable in even 10 years. I therefore do not rely on any special Firefox or Chrome functionality, particularly any plugins or extensions. Additionally I split my usage of the browsers evenly between the two in an attempt to ensure that I do not become reliant on Firefox or Chrome specific behavior or abilities that I may lose access to in the future.
My problem with Firefox/Chrome is a problem that I have with IDEs. They come and go, they change and "improve" over time in ways that are not backwards compatible from a UX perspective. I want none of that. A carpenter does not worry about the interface to his tablesaw changing in 10 years, forcing him learn a new set of skills to experience the same functionality. That sort of stability is what I strive for.
Edit: As for text editor plugins typically being out of date... I just checked. The most 'out of date' plugin that I have is actually just my colorscheme, having it's last commit on Fri Mar 2 14:59:51 2012 -0600. All of the rest have had commits in the past 6 months. A quarter of them have had updates in the past month.