In terms of efficiency, this is probably the fastest way to empty a plane. But judging by the reaction of 99% of the posters, it's never going to happen because front to back is totally ingrained into our flying psyche. And at the end of the day, efficiency is probably overrated, given that people travel with families, colleagues, etc.

On the other hand, I will admit that the last few times I have had an aisle seat just behind the exit rows, I have been surprised by the number of people in window and aisle seats who took a LONG time to get their stuff down from the overhead bins. There were multiple instances when the whole aisle up to the front (10 or 15 rows on a 737 or A320) was empty, but no one was moving because one or two people were blocking it in order to get their stuff down and get organized. Maybe it's this behavior (also frowned upon by most posters) that precipitated the OP.

And as other have pointed out, this is only an issue if you have a gate. If you're on a bus, everyone has to wait for everyone else, so let's be civil and patient (which you should be in any case).