I think people tend to grossly exaggerate how many emails they really do get. Are you really that damn busy that you can't spend a minute or less writing a more natural and conversational reply that indicates to the other person that you're reciprocating the amount of thought and effort they invested in their message? I agree with some others here in saying that this is awkward. You don't strive for efficiency in soc…
It's not that simple.
If I'm in the middle of a coding binge I can switch over and fire off a 'VSRE' without losing place. Converting that into a 'sociable' reply requires a mental context switch out of coding land and into human land. That doesn't cost me 2 minutes, It costs me half an hour [0]. So either the e-mail gets a terse response, or the sender waits a couple hours till I hit a mental break point in what I'm doing.