"Never found deep to be true."
You are much too set in your ways Blu !!
The deep water is 4 or 5 degrees warmer than the shallow water and coves. A couple of my friends and I have caught over 150 crappies in 2 and half days of fishing and we are not fishing shallower than 30 foot of water. I have been taking temperature readings with a thermometer out there under the ice for the past 5 years. Deep water (30+) will be 36-37 degrees compared to water that is 20 some foot of water or less only being 33-34 degrees. A couple degrees might not make a difference to you and I but it could mean the difference between life and death to a cold blooded fish. That is why you see fish with their heads right up against wood or concrete during early season cold fronts. With all factors being relatively equal (O2, food, ect.) a fish will pick comfort and relate to the warmer or cooler (depending on the time of year) water.
Yesterday the grill was rockin with maple & cheddar brats, marinated venison backstraps, and butterflied venison loin. The deer meat was cooked medium rare and was as tender and tasty as any cut of meat off any animal anywhere. Venison is amazingly good !!!