I don't think any fields are really unique anymore, unless you are a professional clown or violin maker or ballroom dancer or something like that.I wouldn't sweat the PS unless you wrote it all about how computing makes you special. Then maybe it will sound silly, but you are allowed a little bit of well-written self-delusion. Doubt the adcoms are really wowed by many essays anymore. No, not even the one Al Gore wrote about inventing the internet.
The thought of reading dense, dry contracts is pure ecstasy after 7 years (more in school) of "if (x == y) then InsertToDatabase(x, y)".