|No such thing as a small change|
"It depends" on what you (and they!) mean.
Sure, we use our tools. For instance, you are clearly a misguided vim heathen, whereas I program in the light of pure (X)Emacs. Even vi lovers are better than the wimps who "program" Perl using pico. Then there are tagging tools, cross-referencing tools, different modules for profiling, programs for printing code, ... Since we all have Too Much Time, we tweak our tools: syntax highlighting editors, macros, indentation styles, ...
So almost no two environments are alike.
But are we really each building our own tools? Not really. I didn't write my text editor. RMS did, but he still uses other tools he did not write. I pick and choose which Emacs Lisp extensions to add to my basic setup; I occasionally add some Emacs Lisp of my own, but I did not write my own editing environment. I suspect you did not, either.
The solution? Set things up so you can work from any station at your place of work. With centrally-installed Emacs, vi, compilers, perl, and a few other well-chosen components, you get access to your heart's desire (or at least to your less-hated tool).
But how to load your configuration? Usernames are a great help here (too)! When I log on as ariels, I can run Emacs and know it will read ~ariels/.emacs for configuration.
I believe in centrally-installed tools, but with an "open" administration policy: If I want some other tool, I stuff it in ~ariels/bin (or an architecture-dependent subdirectory for a binary). If two more people show an interest, I should be able to ask administration to install it centrally.
Everyone should use mostly centrally-provided tools, but with personal configurations. Woe to the person who forces an editor on me.