PG does increase throat hit, and it also carries flavor a bit better. Also, it will gunk up an atomizer much more slowly than running higher VG juices, especially in a tank. There are some VG juices out there that are so viscous they are made only for dripping. The higher the PG, the more quickly it burns through an atomizer, which also helps with flavor delivery. Some ejuice makers are giving the option of adding extra flavor shots to higher VG juices for tank use, because there tends to be some flavor loss the lower the PG level particularly in a tank. Also, lower nicotine level affects the flavor. So if you're vaping a 12mg 80/20 VG/PG juice it's going to have a more pronounced flavor than if you were vaping that same juice, on the same set-up, at 3mg or 0mg.
Set up also plays a roll. How many watts you're vaping at. What sort of tanks and coils you're using. All that that contributes to flavor profiles and how pronounced a flavor is. Now there are some higher VG juices that even using a lower wattage device (like my 20w iStick) in a tank there is a tremendous amount of flavor. Cuttwood makes 70/30 VG/PG and while they tend to gunk up my atty really quick, there is a ton of flavor. My personal favorite brand, at the moment, is Lost Art. Their's are 60/40 and just right, in my humble opinion. And the flavor? Good lordsy!