S'funny, having flown the 737, 747-400 and A320 family, I know which one I consider least slippery, and as a clue it isn't the 737 or the Airbus.
The 747-400 may be more slippery than the classic, but once the flaps get to 5 it's anything but slippery - goes down like a brick and requires quite a bit of power to maintain the glideslope. It's the time that f5 takes to run that's the problem, the aircraft decelerates quicker than the flaps run (unless the deployment is started closer to lplacard speeds).
The A319 especially is a little b@stard to slow down (as, I believe, is a light 757) with relatively high residual thrust, and maintaining the glide rarely requires anything above idle thrust.
Maybe part of the perception is the relative lack of handling by us heavy metal drivers?