Who, where? Please show me one single post on the forums here about somebody complaining about the Satoshi client's resource usage or performance.
Not trying to defend the ScamCoin there, but actually a whopping 1GiB wasted in a not too easily configurable folder/partition is actually a bit of a PITA, not to mention the trashing of the HD when downloading the blockchain or making a large transaction. I've asked several times how this would scale to, say, 100 times the current amount of users, and I have to say I never got any really convincing answer to that...