I gotta' be one of the odd ones... I started on flats in the late 70's/early 80's. Moved to toe clips with mountainbikes in the mid 80's, then clipless SPD's in late 80's when they came out...
Rode clipless off road almost exclusively unless I was touring (big lap in 92' and Cape York in 95').
But a couple of years back... I switched back to flats.
full circle.