I am also one who cuts off the loops and ties the leader butt directly on to the fly line. The knot I use is half of a grinner knot with 4 turns - which is topologically the same as a snell or a nail/needle knot but easier to tie. The initial set of wraps around the standing part of the line might seem superfluous, but they the wraps invert so that the leader is coming out of the center of the knot on both ends.