I think people keep confusing low Essence with being a cyberzombie. If a player doesn't play his character as an apathetic robot going through the mere motions of being human, it might not be because he "just doesn't get it", but because he doesn't have the ability to read the GM's mind. A shadowrunner with a high level of augmentations is desperately seizing any edge available to keep ahead of the power curve, in one of the Sixth World's most dangerous professions. I have a hard time seeing any street samurai losing his survival instincts or drive for self-improvement, when his augmentations were taken to enhance those very things.
Augmentations offer plenty of roleplaying hooks, but if anything, Essence is overemphasized by too many people, and all of the other roleplaying opportunities get drowned out by the tired old "cyberware eats your soul" trope - when Essence is mainly a metagame limit to how much stuff you can cram into your body. Because again, the affects of low Essence are comparatively subtle.
I prefer to look at the other ways augmentations can affect a character. I played a street samurai who had mnemonic enhancers, and hated them, because when you do violence for a living, being able to recall it in perfect detail is a bad thing. Another character, not one of mine, had skillwires, and felt curiously distant when using them; it was like the software was doing it, not her - which could be both good and bad, depending. I think of synaptic boosters, and I remember all of the times I am stuck in a grocery line behind someone plodding like they're in slow motion, and you want to scream "Hurry up!" Having synaptic boosters, when most people don't, could feel like that, all the time. Augmentations can be cool, too. They can turn you from the nerd who got stuffed into lockers into someone who is buff and tough. They can give you sensations that humans couldn't experience before. They can make you literally superhuman.
Sure, the guy with cyberlimbs, a pain regulator, and skillwires might feel inhuman, disconnected from his own actions, a bit numb. But what about the guy with tricked-out cybereyes, muscle augmentation and toner, tailored pheromones, cerebral boosters, and a sleep regulator? Especially if before, he was a puny specimen with insomnia and poor eyesight? He probably feels great.