I almost never do. It's actually a bit weird, I tend to ramble more in writing than I ever would while speaking and usually end up with mini-essays even for relatively straightforward ideas.

This is two-pronged, partly because I enjoy writing and expressing myself through it more than I do speaking, but it's mostly because I'm obsessive about conveying nuances with as much precision as I can, especially in a medium as restrictive to conveyance as writing is (thinking about not having non-verbal and other purely contextual cues at my disposal).

It's not like I intentionally bring out the expensive words just to flaunt my vocabulary (I even have issues with being perceived as pretentious), it's just that some things simply require the extra precision when expressing their full complexity.

P.S.: Jesus Christ...