You can't expect your colleagues to change their minds, unfortunately. We're practically breast-fed with the idea that wordy types are automatically blowhards or pretentious members of academia, and it doesn't help that popular culture reinforces that impression. Common examples involve the Kingpin from Spider-Man, Mammoth Mogul from the various Archie Sonic runs, virtually every animated role Tony Jay's ever had, Darth Vader, etc.
Being verbose is a wonderful asset in some circumstances. It's saved my life countless times in university halls, but the very same teachers who lauded me for the quality of my vocabulary also hammered in one simple rule I've tried to take to heart as earnestly as possible.
It's the K.I.S.S. rule. Keep It Simple, Stupid. Be as verbose as you can, dig inside that mental thesaurus as much as you'd like; but remember things like time constraints and short attention spans. We live in a world and society where people want their information NOW, not in thirty seconds, when you'll be done pushing out the last segment of your latest mass of semicolons.
You're lucky, OP. You've obviously hit a string of people who didn't mind deciphering your post, and figuring out just what you wanted to get off your chest. You're also lucky that I, as a second-language English speaker, have a sufficient grasp on the language to have been able to follow along. Just remember that you won't always have that luck, and that on some occasions, saying something like this...
"My coworkers are getting annoyed at how verbose I am. I just don't know if it's wrong of me to put more effort into expressing myself or if it's their problem if they're not as well read."
...in no way reduces you. That was clear, concise, and it didn't exactly make me sound like a chatspeak-using mindless drone. It also unearths the fundamental problem with that attitude, which is to say that being of a superior level of verbal agility might be commendable, but boasting about it isn't.
Just remember this: people who talk like I'm typing now aren't morons. Sinking to our level, so to speak, won't kill you at all. It won't even diminish the quality of your lexicon. You'll just realize that there's a time and a place for more precious arrangements.