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…
So, if I pop into personal email for 5 min during work hours, I don't want to have to sit and think for a few minutes to reply to one email. If I don't pop into personal email every so often, then people complain that I'm unresponsive or do really intrusive things like calling me.