I am a firm believer in A-Jay's statement above.
Quick story .... I fish in a local smallmouth tournament every year, basically a bunch of buddies trying to get bragging rights for a year. Small lake (500 acres) and 20 boats. I have placed in the top three for the last 4 years and the best fish have not come from the same spot even once. So yes, in the summer I run and gun, returning to the same spots 3-4 times throughout the day but I don't spend more than 20 minutes per spot if I don't get a bite. Remember, other boats have hit the same spots.
Ok, I am done rambling .....