Do you love big bluegill?
Heck yes, that is a very good way to catch them, because the BG tend to scatter this time of the year. Find the depth they are at and make sure your drift stays in that depth. The bite can be light so keep a tight line and when you feel the slightest resistance rise up with the rod tip.
I like to find them with conventional tackle and then switch to a flyrod with a sinking line once they are located, because for me the flyrod is the way to go. The water I fish in is deep and I have learned by experince to look for 20 ft. of water and start fishing.
You ask a good question.