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 . 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.
I also use the following website to set a timer for however long I have to program (whether it be a 15 minute sprint or a luxurious 90 minute block):
As for the main topic, I have this as my signature:
Oh, _that_ explains the number of "Dear [full-version-of-my-name]", overlooking the shorter version in my own sign off.
You can't do that when you code and also run a business. I'd love for this to catch on, I'm going to discuss it with my team at least for IM.