Of course it looks thinner if you take care to only photograph it from angles where the hump isn't visible. It's also interesting that the cover glass was a challenge, since monitors don't need cover glass; it's purely an aesthetic addition.
Colours look better under glass too, though obviously it has its downsides (glare).
Re: The Tech Behind Apple’s Impossibly Thin New iMacs
#51An LCD is already glass; I'm skeptical that adding another layer improves contrast.