I find in season scouting very crucial. Summer and early fall I don't go near my areas, I know them, no need to go into them. Also once the season starts I may take a shot or 2 at a deep in spot, but generally I try to hunt edges and lesser invasive areas and stack up on does. Once things heat up I will move closer into my better stands. Often times I will use a VERY windy day to sneak thru the woods checking for the hot areas and then make decisions about hunting them.

In short, in season "on the fly" scouting to me is very important, but I also don't go running thru it alot. 1 trip, in ideal conditions is all that is needed to gain the info I need.