The "burst of power" addiction (and believe me it is an addiction) is common to many pilots flying the 737. These pilots have picked it up from watching other pilots or listening to war stories from olde captains who may have flown the 727. From these myths they then think it is a real cool method of getting a smooth touch down.
Interestingly, you don't see much of this technique in the simulator yet it is relatively common among certain pilots in the real aeroplane. Inevitably the aircraft floats and lands long, albeit often smoothly. That makes the pilot real happy and he is now convinced for the rest of his career that a burst of power is the key to smooth landings.
Other new pilots watch him and the technique is perpetuated. Of course there are times when additional power is called for near the flare but it is not a standard technique for normal landings and needs to be severely discouraged as bad flying technique