I never really understood 1-1/2 step compared to half step when put to practical use. I think the problem people have with half step, particularly 6/7-speed set ups, is that they tray to progress through the gear range in sequence. In practicality, this is a PIA with all of the double shifts. I find that it is far easier to simply forget which front ring you are in, and progress up and down the cluster/freewheel until you reach cruising speed; THEN adjust up or down a half step if necessary. 1-1/2 step is basically the same, except that you have to climb or dump two in the rear with the double shift. In the end, they are the same concept, and I would encourage you to use which ever you prefer.

This is also why I do not like it for racing/pace lines. You need to work the rear clusters for subtle changes in speed, and only swap chainrings when there is a significant change in terrain (e.g. crests or bottoms of large hills). For this, I prefer true "Alpine" gearing where the front chainrings represent "ranges" with overlap in the gear ratios between them.