I think orderly deplaning allowing the rows ahead to exit is appropriate. The way I imagine what I think the OP describes - I could see all the aisle folks deplaning and the remainder of the plane trapped and then getting "cutoff" as the back of the plane starts to fill that line up.... basically a mess.

I prefer just letting the plane deplane by rows. I often sit toward the back, and it really is not that much of a wait. 9/10 times the baggage isnt even on the carousel by the time I get there (with a bathroom break on the way.) Nothing more annoying than being told of urgent connections then I see the guy standing in the Tim Hortons line....