For the last year or two I've used my 70-200 2.8II A LOT with my 7D. Every racetrack visit (with TC's as needed), zoo trip, photoshoot outside with my daughter, waterskiing shots of my wife, etc. Probably 25k pictures.
HOWEVER- a few months ago I got a great deal on a new 70-300L and picked it up, figuring if I didn't use it much I could sell it for around what I paid for it, and I had been curious about it. I gotta say- the 70-200 hasn't gotten as much use. Went to the Formula 1 race down in Austin, and the combo of the 70-300L and my 400 f/5.6L was a perfect lightweight setup to put in a small hiking backpack, with great IQ. Thing is- the 70-200 is so irreplaceable due to it's f/2.8 IQ and range, with and without TC's. I can't bring myself to sell it, even though I question the logic of having both the 70-200 & the 70-300L.