My best boarding experience was with a COPA B737-800: Perfectly organized according to status and boarding groups.....INTO A BUS...haha
and then the usual cattle rush from the bus up the air stairs in basically the reverse boarding order 
well, thats what lauda and ryanair and wizz are doing: they "board" you on a bus (you can pay extra for priority-boarding). when the bus is full, it drives to the plane. when the plane is ready, the bus doors open - people of course rush crosswise to front and aft door from the bus to the plane.
and it is much faster than what ba/lh/af are doing - mostly since people can only really take backpack and no trolley with them free of charge [yes, a lot of people wear some dented heavy looking jackets in mid summer]
on the "premium" airlines, they take their trolley plus the extra item plus a duty-free-bag (usually an old one with all kinds of stuff in it, but it looks like a recent purchase

), of course it takes a long time to find space for all that, and sometimes trolleys have to be checked in.