I disagree, and will do my best to dispel that illusion upon the game's release. I plan on my main Operative guy being a Medium, and I will try to avoid using disguises entirely. Just hacking stuff and putting up radar for my team. I'm gonna be the most teamwork-oriented Operative ever!
For me, it really depends on how effective being disguised behind enemy lines will be compared to this in terms of assisting your team. Because if I feel I can help my team more by playing similarly to how you described, I probably will.
EDIT: Oh, and for the record, I see your method being quite effective - I just think people keep seeing the Bug when they picture Operative, and associate him with a secret agent assassinating people behind enemy lines.