This technique works well to solder quickly with a soldering iron. It you put down solderpaste on all the pads (leaded parts, like SSOP, TQFP, SOT23, passives), soldering with an iron is just a touch. One trick is press down the component (like the SOT23 part) with tweezers while you touch the pin/pad, otherwise it will move and "freeze" in the wrong spot when the solder cools.