Either way, I don't think I'd go much further from stock than I already do because like shortlived illustrates, there's just sometimes you have to use the vanilla version of whatever you're dealing with, no matter what you do.
I find that the most time is spent for me in my main vim session on my computer and the ancillary servers do not need the more advanced text editing features because I am just not in them that often.
But in this situation, there's one variable missing: the urgency with which off system editing happens. If a machine is blow'd up and stuck in single-user mode, and the only way to get it back is a heroic vi session, or if somebody screwed up an apache config and your site is bouncing customers, or whatever, those are the times you don't need the added frustration of an unfamiliar editor.
That, and I didn't find stock vim to be uncomfortable once I learned it, so I don't feel like I'm sacrificing much to get the luxury of my editor working pretty much the same everywhere in the universe.
The biggest thing I have found with all of this tho, is that everyone has different prefs, so if you're pretty happy with the way it's working, don't change because some folks on the internet are suggesting it, but if sounds interesting, give it a try, the worst that happens is you have to revert to the old way. (different optimization problem here I guess :) )
Getting your dotfiles in git once didn't seem necessary to me - and indeed you can get by just fine - but god it is nice not to have to redo any configs and have my setup always ratcheting forward because I don't keep losing things or not having them.