Well, I can speak from personal experience that neither me, nor any of my architect friends ever say anything other than "designed". And I never heard a prof, nor any of the architects I've ever worked for/with use the term "architected". I only hear it used by people outside of the profession, and usually only as a fairly-recent bit of "business speak". In fact, most of the people I know in the AIA find it quite irritating when people use it as a verb, since they claim to have "architected" something yet would probably only reply with a befuddled look when asked about Le Corbusier.
I'm sure I'm just overly sensitive to it since it's a world I'm involved in as opposed to those who merely reference it. I'll own it as my hang up.

But still, my spell checker here keeps red underlining every instance of it I just typed. :P

I see its origin as simpler than that. People love to use bigger words to aggrandize the perception of their vocabulary and intellect. No easier way to do that than to append (or in this case, "prepend') a word with an extra (unnecessary and wholly incorrect) syllable.

It's the same as people saying "We architected this" rather than "We designed this". Even actual architects say "designed". I never heard it used as a verb in ARCH, only later in the business world. But people think "architected" sounds more refined and erudite. To me it just says that they don't know the difference between a verb and a noun.

And to me, using "irregardless" just says you don't think before you speak (or listen to yourself while doing it). Like ending on a preposition... Correct or not, I try to avoid it. I like that it makes me actually plan the sentence before it spills forth from my face. :)

Came in to remind everyone that "He who controls The Spice controls the universe!"

/Leaving happy